Journal articles on the topic 'Magneto-Mechanical measurements'
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1
Sukup, Šimon, and Oleg Heczko. "Magneto-mechanical deformation of \ch{Ni50Mn28Ga22} shape memory alloy." Journal of the ASB Society 2, no. 1 (December 27, 2021): 20–27. http://dx.doi.org/10.51337/jasb20211227003.
Abstract:
This study deals with pseudoplastic deformation of Ni50Mn28Ga22 alloy exhibiting mechanically and magnetically induced crystal reorientation. The new approach was introduced, taking into account crystals with single initial variant as well as nucleation of different orientation. Initially, observations from optical microscope and AFM (atomic force microscope) were correlated with the mechanical measurements from stress-strain machine to characterize boundaries between crystal variants. These observations were subsequently used to clarify the results of the mechanical deformation tests. By magnetizing samples in VSM (vibrating-sample magnetometer), analogous magnetic measurements to mechanical tests were conducted. The two types of measurements were then compared with respect to energy. The discrepancy found between the model and measurements is in agreement with previous studies. Some experimental factors and possible errors that may affect measurement have been discussed. Nevertheless, the observed differences remain an unresolved issue suggesting a need for a modification of the model.
2
Le Bras, Y., and J. M. Greneche. "From magneto-elastic impedance model to accurate magneto-mechanical coefficient measurements." Review of Scientific Instruments 92, no. 3 (March 1, 2021): 035004. http://dx.doi.org/10.1063/5.0030312.
3
Stachowiak, Dorota, and Andrzej Demenko. "Finite Element and Experimental Analysis of an Axisymmetric Electromechanical Converter with a Magnetostrictive Rod." Energies 13, no. 5 (March 6, 2020): 1230. http://dx.doi.org/10.3390/en13051230.
Abstract:
The paper presents the numerical and experimental investigations of the axisymmetric magnetostrictive actuator with a Terfenol-D rod. The applied model consists of equations that describe the magnetic and mechanical displacement fields. The equations of both fields are coupled through a nonlinear magneto-mechanical constitutive law. The model is considered as 2D axisymmetric. The finite element method is used to solve the field equations. Special attention is paid to the proper definition of magneto-mechanical relations. These relations are formed from measurements. A unique test stand is designed for the experimental investigation. The selected results of the simulation are compared with the measurement results. The comparison shows that the applied numerical model is sufficiently accurate.
4
Fang, Dai Ning, Xu Jun Zhao, Yong Mao Pei, Zhan Wei Liu, Fa Xin Li, and Xue Feng. "Experimental Study on Electro-Magneto-Mechanical Behaviour of Electromagnetic Solids." Key Engineering Materials 326-328 (December 2006): 5–12. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.5.
Abstract:
New experiment systems that can offer electromechanical and electromagnetic coupling loads were established. Measurement skills and technologies under coupling loads have been developed. The experimental difficulties and technical problems, such as insulation, discharge, compressive testing of brittle ferroelectrics and so on, were well resolved. The constitutive experiments of piezo/ferroelectrics or ferromagnetic materials were carried out. Moiré Interferometry was applied to the measurement of transformation of the crack tip in ferroelectric ceramics under coupling loads. The deformation concentration near the internal electrode tip caused by non-uniform electric field was investigated by means of Digital Speckle Correlation Method (DSCM). With an aim to accomplish both measurements of constitutive response of the magnetostrictive materials and the fracture experiments of general soft ferromagnetic materials, a magnetomechanical-coupling testing setup was established, which is controlled by an industrial PC. The software was programmed to monitor the testing process and to deal with the acquired data. The characteristic curves of ferromagnetic materials, such as TbxDy1-xFe2 alloys, were measured, including the hysteresis loops, the magnetostriction curve and stress-strain curve.
5
Makridis, Antonios, Nikolaos Maniotis, Dimitrios Papadopoulos, Pavlos Kyriazopoulos, and Makis Angelakeris. "A Novel Two-Stage 3D-Printed Halbach Array-Based Device for Magneto-Mechanical Applications." Magnetochemistry 10, no. 4 (March 29, 2024): 21. http://dx.doi.org/10.3390/magnetochemistry10040021.
Abstract:
This research unveils a versatile Halbach array magnetic device with promising biomedical applications, offering innovative solutions for targeted therapy and disease management in evolving biomedical engineering. This paper explores the potential of a novel Halbach array-based device for harnessing magneto-mechanical phenomena in biomedical applications. The study employs computational modeling using COMSOL Multiphysics to define the device’s magnetic properties and validate its operation within the theoretical prediction. The research catalogs the device’s operational modes and assesses crucial parameters related to magneto-mechanical biomedical modalities, including magnetic field strength, gradient, and force. Experimental validation of numerical findings through magnetic field measurements confirms the device’s multifaceted potential, particularly in targeted drug delivery and tissue engineering applications. Finally, the adaptability of the magnetic arrangements for various scenarios is also highlighted. This investigation provides valuable insights into integrating magneto-mechanical principles into biomedical engineering. It paves the way for further research and innovative approaches in theranostics, positioning the presented apparatus as a promising tool with untapped potential for future exploration and discovery in the evolving biomedical field.
6
Diguet, Gildas, Gaël Sebald, Masami Nakano, Mickaël Lallart, and Jean-Yves Cavaillé. "Magnetic behavior of magneto-rheological foam under uniaxial compression strain." Smart Materials and Structures 31, no. 2 (December 27, 2021): 025018. http://dx.doi.org/10.1088/1361-665x/ac3fc8.
Abstract:
Abstract This study reports the development of a magneto-rheological foam, which consists in a porous matrix filled by ferromagnetic particles. The porous matrix of such a composite being easily deformable, large magnetic properties changes are expected. The measurements of the magnetic properties of such a magneto-rheological foam submitted to a compressive strain are reported. Main aspect of the magnetic properties is the low field magnetic permeability as the function of the compression and filling factor. Then, larger field magnetization measurement allowed to investigate the saturation field as a function of the filling factor. Because of the large amount of pores in the material, the magnetic relative permeability, µ r, is quite small (µ r ∼ 1). However, these materials can be easily deformed over a large range of strain providing important relative variation of the magnetic properties under mechanical solicitation. The composite magnetic permeability is increasing under compression for all the considered filling factors. A model is then developed to understand the variation of the permeability with the strain. Hence, from a simple concept consisting of taking advantage of high deformation of foams, the present study demonstrates the interest of such a highly compressible while cheap composite for obtaining a large magneto-rheological effect.
7
Wierzcholski, Krzysztof, and Andrzej Miszczak. "Electro-magneto-hydrodynamic lubrication." Open Physics 16, no. 1 (May 30, 2018): 285–91. http://dx.doi.org/10.1515/phys-2018-0040.
Abstract:
Abstract The topic of the presented paper aims to demonstrate a new principle of hydrodynamic lubrication in mechanical, thermal and electro-magnetic fields. Up till now, when dealing with the hydrodynamic theory lubrication, many authors of scientific papers have assumed the constant oil dynamic viscosity value without variations caused by temperature crosswise the film thickness. Simultaneously, due to the numerous AFM measurements, it appears that oil temperature gradients and oil viscosity changes in the bearing gap height directions cannot be omitted. Therefore, in this paper, the problem of the viscosity changes across the lubricant thin layer was resolved as the main novelty in principles of mechanical thermal lubrication. The method of solving the mentioned problem was manifested by a general model of semi-analytical solutions of isothermal electro-magneto-elastohydro-dynamic and non-Newtonian, lubrication problem formulated for two deformable rotational surfaces in curvilinear, co-ordinates.
8
Stachowiak, Dorota. "Finite element analysis of the active element displacement in a giant magnetostrictive transducer." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, no. 4 (July 4, 2016): 1371–81. http://dx.doi.org/10.1108/compel-08-2015-0304.
Abstract:
Purpose – The purpose of this paper is to find the method for determining the displacement of the active element in a giant magnetostrictive transducer. Design/methodology/approach – The giant magnetostrictive transducer with the active element made of Terfenol-D has been considered. A structure with an axisymmetrical transducer has been proposed. In the proposed model the coupling of magnetic and mechanical field has been taken into account. Maxwell’s equations for electromagnetics and Navier’s equations for mechanical systems are formulated in weak form and coupled using a nonlinear magneto-mechanical constitutive law for Terfenol-D. In order to obtain the distribution of the magnetic and mechanical fields the finite element method was used. The elaborated nonlinear magnetostrictive model has been implemented by using a finite element weak formulation with COMSOL Multiphysics. Findings – The elaborated model for the giant magnetostrictive transducer allows to take into account the magneto-mechanical coupling as well as the material’s nonlinearity. The calculation results of the strain distributions caused by magnetostrictive forces have been presented. The output displacement of a transducer vs supply current for different compressive preload stresses has been calculated and measured. The simulation and measurements results are in close agreement. Research limitations/implications – Taking advantage of the geometrical structure of the prototype of the giant magnetostrictive transducer the computations are performed in an axial-symmetric domain with cylindrical coordinates (r, z, ϑ). The axisymmetric formulation describes the giant magnetostrictive transducers (GMT) without significant loss of accuracy. This approach leads to smaller numerical models and reduced computational time. Practical implications – The elaborated magneto-mechanical model can be used to the design and optimize the structure of GMT. Originality/value – The paper offers the magneto-mechanical model of the giant magnetostrictive transducer. The elaborated model can predict behavior of the magnetostrictive materials it can be used as a tool for the design process of the giant magnetostrictive transducer.
9
Yoffe, Alexander, Hadas Kaniel, and Doron Shilo. "The temperature effect on the magneto-mechanical response of magnetostrictive composites for stress sensing applications." Functional Materials Letters 10, no. 05 (October 2017): 1750060. http://dx.doi.org/10.1142/s1793604717500606.
Abstract:
Stress induced magnetic field changes in epoxy-based Terfenol-D composite materials offer a unique way for stress sensing by using a remote magnetic field sensor. In this paper, we report simultaneous measurements of the stress, strain and emitted magnetic field during compressive tests performed at different temperatures in the range of [Formula: see text]C–65[Formula: see text]C. The observed results are explained based on the physical processes that occur at different stresses and temperature ranges. Measurement results reveal a temperature range ([Formula: see text]C–45[Formula: see text]C) suitable for stress sensing applications, at which the reverse magnetostrictive response is almost temperature insensitive. At 65[Formula: see text]C, the epoxy demonstrated a significant softening due to the glass transition, indicating that a high glass transition temperature is an important desired property for the epoxy matrix.
10
D';Anna, G., W. Benoit, and H. Berger. "Investigation of Flux-Line Assembly Mechanical Properties in 2223-Phase Bi(Pb)SrCaCuO Ceramic by Magneto-Mechanical Measurements." Physica Status Solidi (a) 125, no. 2 (June 16, 1991): 589–96. http://dx.doi.org/10.1002/pssa.2211250220.
11
Sanchez-Seguame, Gala, Hugo Avalos-Sanchez, Jesus Eduardo Lugo, Eduardo Antonio Murillo-Bracamontes, Martha Alicia Palomino-Ovando, Orlando Hernández-Cristobal, José Juan Gervacio-Arciniega, and Miller Toledo-Solano. "Magnetic-Dielectric Cantilevers for Atomic Force Microscopy." Nanomaterials 14, no. 10 (May 17, 2024): 874. http://dx.doi.org/10.3390/nano14100874.
Abstract:
Atomic force microscopy (AFM) is a technique that relies on detecting forces at the nanonewton scale. It involves using a cantilever with a tiny tip at one end. This tip interacts with the short- and long-range forces of material surfaces. These cantilevers are typically manufactured with Si or Si3N4 and synthesized using a lithography technique, which implies a high cost. On the other hand, through simple chemical methods, it is possible to synthesize a magneto-dielectric composite made up of artificial SiO2 opals infiltrated with superparamagnetic nanoparticles of Fe3O4. From these materials, it is possible to obtain tipless cantilevers that can be used in AFM analysis. Tipless cantilevers are an alternative tool in nanoscale exploration, offering a versatile approach to surface analysis. Unlike traditional AFM probes, tipless versions eliminate the challenges associated with tip wear, ensuring prolonged stability during measurements. This makes tipless AFM particularly valuable for imaging delicate or soft samples, as it prevents sample damage and provides precise measurements of topography and mechanical and electromechanical properties. This study presents the results of the characterization of known surfaces using magneto-dielectric cantilevers and commercial cantilevers based on Si. The characterization will be carried out through contact and non-contact topography measurements.
12
Rademeyer, Melanie, Shalene Bothma, Stefan Coetzee, David Liles, Mark Turnbull, and Christopher Landee. "Magneto-structural relationships in Cu(II) containing hybrid materials." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C1370. http://dx.doi.org/10.1107/s205327331408629x.
Abstract:
The combination of inorganic Cu(II) halides with organic amine moieties within a single hybrid material allows for the combination of the properties of both components in a single material. Cu(II) ions may afford magnetic properties to such a hybrid material, while the organic component can be employed to template the structure and to shield the magnetic ions, thereby controlling the magnetic dimensionality of the structure. In this investigation, structural characterisation by single crystal X-ray diffraction and magnetic susceptibility measurements employing SQUID magnetometry, allows for the identification of magneto-structural relationships in the materials. Examples highlighting the magneto-structural properties in these Cu(II) containing hybrid materials will be presented. The effect of changes in organic component or anion on the structural characteristics will be analysed using the principles of crystal engineering, while the magnetic data is fitted to suitable quantum mechanical models to allow for the identification of magnetic exchange pathways and -parameters. It will be shown how computational techniques may assist in the interpretation of the magnetic data.
13
Hakobyan, G., A. Seyranyan, A. Khachatryan, S. Burnazyan, and V. Seyranyan. "Regenerative therapy for the treatment of periimplantitis." SUCHASNA STOMATOLOHIYA 107, no. 3 (2021): 50–57. http://dx.doi.org/10.33295/1992-576x-2021-3-50.
Abstract:
The purpose of this study is to evaluate the outcome of regenerative therapy of peri-implantitis. The 32 patients involved in this study with inflammatorydestructive processes in the field of peri-implant tissues of osseointegrated implants. The diagnostic parameters used for assessing peri-implantitis include clinical indices, Probing Pocket Depth (PPD), Bleeding On Probing (BOP), periimplant radiography. 16 implants with peri-implant mucositis, 8 implants with early peri-implantitis and 5 implants with moderate peri-implantitis was treated only conservative treatments methods, 6 implants with early peri-implantitis, 7 implants with moderate peri-implantitis and 4 implants with severe periimplantitis was treated surgically. PPD and BOP data at the re-examination were retrospectively compared to baseline data. A statistical significant reduction in both PPD and BOP were seen at alltimepoints as compared with the baseline clinical measurements. Stable clinical measurements PPD and BOP were demonstrated after 1 year the initial treatment, remaining stable during the following three years. Surgical regenerative treatment combined with mechanical and chemical detoxification of the implants’ surface, magneto-laser therapy and regenerative therapy using an autologous bone, xenograft, hyaluronic acid and a restorablemembrane a reliable method for stopping and treatment peri-implantitis. Key words: Peri-Implantitis; Dental Implant; Regenerative Therapy; Magneto-Laser Therapy; Hyaluronic Acid.
14
Ono, Takahito. "(Invited) Magneto-Mechanical Micro-Nano Devices with Electrodeposited Magnetostriction Films." ECS Meeting Abstracts MA2023-02, no. 30 (December 22, 2023): 1547. http://dx.doi.org/10.1149/ma2023-02301547mtgabs.
Abstract:
Microsystems play an important role in IoT sensors and actuators in the recent information and communication society. Among these, actuators are important elements used in transmitters, acoustic devices, and optical elements, and for those devices, piezoelectric thin films have been used widely. Magnetostrictive materials are expected to have even greater actuation performance than that of the piezoelectric films, but in the magnetostrictive films integration technologies with a high performance have not yet been fully developed. We have developed the film deposition technologies for magnetostriction materials by electrodeposition and apply them to actuators and sensors [1,2]. The FeGa, TbDyFe, and FeCo magnetic materials are known as giant magnetostriction materials [3]. In this study, the film deposition method for these materials have been developed by electrodeposition. Tbe electrodeposition of rare earth elements is generally considered to be difficult, but in this study, by using Fe chelate as a catalyst, the magnetic films containing Fe and rare earth elements have been successfully deposited, and large magnetostriction are achieved. The TbDyFe films show magnetostriction of ~1000 [1]. In addition, large volume magnetostriction has been observed in these amorphous materials. The magnetostrictive materials are known to have a reverse magnetostriction effect, in which the magnetization of the magnetic material changes when it is subjected to strain. They are known to work as strain sensors based on magnetic measurements. In order to demonstrate the strain sensing, a bi-material cantilever of FeGa/Si with a Si Hall sensor integrated on the support has been developed, as shown in Fig. 1 [2]. The vibration of the cantilever can be detected from the magnetization change using the integrated Hall sensor. On the other hand, magnetostrictive actuators generally require an electromagnet to drive them, making them difficult to miniaturize the system. Therefore, an attempt has been made to drive magnetostrictive thin films by injecting spins into them using the spin Hall effect, giving angular momentum to the spins of magnetic materials and changing the spin fluctuations [4]. It is found that a large strain can be generated by spin injection into the TbDyFe film. The above results show that high-performance magnetostrictive films can be deposited by electrodeposition and can be applied to strain sensors and spin-current driven actuators, and are expected to be applied to the development of novel sensors and actuators [5]. References H. Shim, K. Sakamoto, N. Inomata, M. Toda, N. V. Toan and T. Ono, Magnetostrictive Performance of Electrodeposited TbxDy(1−x)Fey Thin Film with Microcantilever Structures, Micromachines 11, 5 (2020) 523. T. Ezura, N. Inomata, T. Ono, Integration of Magnetostrictive Microsensor With Hall Element for Microstructure Resonant Detection, 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), (2021) 418-421. Mohammad Akita Indianto, Masaya Toa, Takahito Ono, Comprehensive study of magnetostriction-based MEMS magnetic sensor of a FeGa/PZT cantilever, Sensors and Actuators A 331, (2021) 112985. H. Arisawa, H. Shim, S. Daimon, T. Kikkawa, Y. Oikawa, S. Takahashi, T. Ono, E. Saitoh, Observation of spin-current striction in a magnet, Nature Communication 13 (2022) 2400. M. A. Indianto, M. Toda, T. Ono, Development of assembled microchannel resonator as an alternative fabrication method of a microchannel resonator for mass sensing in flowing liquid, Biomicrofluidics 14, (2020) 064111. Figure 1
15
Elisa, Mihail, Stefan-Marian Iordache, Ana-Maria Iordache, Constantina Raluca Stefan, Ileana Cristina Vasiliu, Daniel Cristea, Doru Ursutiu, et al. "Investigations Regarding the Addition of ZnO and Li2O-TiO2 to Phosphate-Tellurite Glasses: Structural, Chemical, and Mechanical Properties." Materials 15, no. 5 (February 22, 2022): 1644. http://dx.doi.org/10.3390/ma15051644.
Abstract:
Phosphate and tellurite glasses can be used in optics, optoelectronics, magneto-optics, and nuclear and medical fields. Two series of phosphate-tellurite glasses, (50-x)ZnO-10Al2O3-40P2O5-xTeO2 and (40-x)Li2O-10Al2O3-5TiO2-45P2O5-xTeO2 (x = 5, 10), were synthesized by a non-conventional wet-route, and the mechanical properties as key performance measures for their application in optoelectronics were investigated. X-ray Diffraction (XRD) measurements revealed the vitreous nature of the investigated materials. Instrumented indentation tests allowed the calculation of hardness (H) and Young’s modulus (E) using the Oliver and Pharr model. The influence of increasing the TeO2 content, as well as the substitution of ZnO by Li2O-TiO2, on the variation of hardness, Young’s modulus, penetration depth (PD), and fracture toughness (FT) was evaluated in both series. As a general trend, there is a decrease in the hardness and Young’s modulus with increasing penetration depth. The addition of Li2O and TiO2 instead of ZnO leads to improved hardness and elastic modulus values. Regarding the H/E ratio, it was found that the samples with lower TeO2 content should be significantly more crack-resistant compared to the higher TeO2 content samples. The H3/E2 ratio, being lower than 0.01, revealed a poor resistance of these glasses to plastic deformation. At the same time, a decrease of the fracture toughness with increasing TeO2 content was noticed for each glass series. Based on dilatometry measurements, the thermal expansion coefficient as well as the characteristic temperatures of the glasses were measured. Field Emission Scanning Electron Microscopy-Energy Dispersive X-ray analysis (FESEM-EDX) revealed a uniform distribution of the elements in the bulk samples. The mechanical properties of these vitreous materials are important in relation to their application as magneto-optical Faraday rotators in laser cavities.
16
Koss, Peter A., Ali Riza Durmaz, Andreas Blug, Gennadii Laskin, Omkar Satish Pawar, Kerstin Thiemann, Alexander Bertz, Thomas Straub, and Christian Elsässer. "Optically Pumped Magnetometer Measuring Fatigue-Induced Damage in Steel." Applied Sciences 12, no. 3 (January 26, 2022): 1329. http://dx.doi.org/10.3390/app12031329.
Abstract:
Uniaxial fatigue testing of micro-mechanical metallic specimens can provide valuable insight into damage formation. Magnetic and piezomagnetic testing are commonly used for qualitative characterization of damage in ferromagnetic specimens. Sensitive and accurate measurements with magnetic sensors is a key part of such a characterization. This work presents an experimental setup to induce structural defects in a micro-mechanical fatigue test. Simultaneously, the resulting piezomagnetic signals are measured during the complete lifetime of the tested specimen. The key component is a highly sensitive optically pumped magnetometer (OPM) used to measure the piezomagnetic hysteresis of a small specimen whose structural defects can be analyzed on a small scale by other metallographic characterization methods as well. This setup aims to quantify the magnetic signatures of damage during the fatigue process, which could enable non-destructive mechanical testing of materials. This paper reports the initial results obtained from this novel micro-magneto-mechanical test setup for a ferritic steel specimen.
17
Clark, Andy T., David Marchfield, Zheng Cao, Tong Dang, Nan Tang, Dustin Gilbert, Elise A. Corbin, Kristen S. Buchanan, and Xuemei M. Cheng. "The effect of polymer stiffness on magnetization reversal of magnetorheological elastomers." APL Materials 10, no. 4 (April 1, 2022): 041106. http://dx.doi.org/10.1063/5.0086761.
Abstract:
Ultrasoft magnetorheological elastomers (MREs) offer convenient real-time magnetic field control of mechanical properties that provides a means to mimic mechanical cues and regulators of cells in vitro. Here, we systematically investigate the effect of polymer stiffness on magnetization reversal of MREs using a combination of magnetometry measurements and computational modeling. Poly-dimethylsiloxane-based MREs with Young’s moduli that range over two orders of magnitude were synthesized using commercial polymers Sylgard™ 527, Sylgard 184, and carbonyl iron powder. The magnetic hysteresis loops of the softer MREs exhibit a characteristic pinched loop shape with almost zero remanence and loop widening at intermediate fields that monotonically decreases with increasing polymer stiffness. A simple two-dipole model that incorporates magneto-mechanical coupling not only confirms that micrometer-scale particle motion along the applied magnetic field direction plays a defining role in the magnetic hysteresis of ultrasoft MREs but also reproduces the observed loop shapes and widening trends for MREs with varying polymer stiffnesses.
18
Deldar, Shayan, Marek Smaga, and Tilmann Beck. "Investigating the fatigue behavior of grain-oriented Fe-3%Si steel sheets using magnet-optical Kerr microscopy and micromagnetic multiparameter, microstructure and stress analysis." MATEC Web of Conferences 165 (2018): 06006. http://dx.doi.org/10.1051/matecconf/201816506006.
Abstract:
Fatigue is considered as a reason for a significant number of mechanical failures of engineering materials. Conventionally, microstructural investigations along with stress-strain hysteresis measurements are performed to understand and characterize the fatigue behavior of metallic materials. Moreover, further physical data like temperature, electrical resistance and, in the case of ferromagnetic materials, magnetic properties can be used for a comprehensive characterization of fatigue process. The present work has employed Magneto-Optical Kerr Effect (MOKE) microscope and Micromagnetic Multiparameter, Microstructure and stress Analysis (3MA) system to illustrate magnetic domain structure and various intrinsic magnetic properties including magnetic Barkhausen noise (MBN) of the investigated material. In order to investigate the influence of the mechanical deformation processes on the magnetic parameters, samples were produced out of the grain-oriented electrical steel sheets and were subjected to a tensile test as well as a cyclic strain increase load test with R = 0 at ambient temperature.
19
Gilch, Ines, Tobias Neuwirth, Benedikt Schauerte, Nora Leuning, Simon Sebold, Kay Hameyer, Michael Schulz, and Wolfram Volk. "Impact of residual stress evoked by pyramidal embossing on the magnetic material properties of non-oriented electrical steel." Archive of Applied Mechanics 91, no. 8 (March 13, 2021): 3513–26. http://dx.doi.org/10.1007/s00419-021-01912-6.
Abstract:
AbstractTargeted magnetic flux guidance in the rotor cross section of rotational electrical machines is crucial for the machine’s efficiency. Cutouts in the electrical steel sheets are integrated in the rotor sheets for magnetic flux guidance. These cutouts create thin structures in the rotor sheets which limit the maximum achievable rotational speed under centrifugal forces and the maximum energy density of the rotating electrical machine. In this paper, embossing-induced residual stress, employing the magneto-mechanical Villari effect, is studied as an innovative and alternative flux barrier design with negligible mechanical material deterioration. The overall objective is to replace cutouts by embossings, increasing the mechanical strength of the rotor. The identification of suitable embossing geometries, distributions and methodologies for the local introduction of residual stress is a major challenge. This paper examines finely distributed pyramidal embossings and their effect on the magnetic material behavior. The study is based on simulation and measurements of specimen with a single line of twenty embossing points performed with different punch forces. The magnetic material behavior is analyzed using neutron grating interferometry and a single sheet tester. Numerical examinations using finite element analysis and microhardness measurements provide a more detailed understanding of the interaction of residual stress distribution and magnetic material properties. The results reveal that residual stress induced by embossing affects magnetic material properties. Process parameters can be applied to adjust the magnetic material deterioration and the effect of magnetic flux guidance.
20
Clemente, Carmine S., Abdelmomen Mahgoub, Daniele Davino, and Ciro Visone. "Multiphysics circuit of a magnetostrictive energy harvesting device." Journal of Intelligent Material Systems and Structures 28, no. 17 (January 30, 2017): 2317–30. http://dx.doi.org/10.1177/1045389x16685444.
Abstract:
Kinetic energy harvesting devices based on magnetostrictive materials are composed of several parts, for dealing with multiphysics, including mechanical, magnetic, and electric quantities. An effective method to simulate the effects of different working conditions is important to fully exploit such devices. The aim of this paper is to present an equivalent circuit that can be identified with standard measurements on the device and simulated with a standard circuit simulator, such as Spice. The circuit is a nonlinear three-port circuit, related to the mechanical, magnetic, and electrical parts of the device. Unlike many of the published papers on the subject, the magneto-mechanical modeling is quite realistic and exploits nonlinear functions and the full coupling among the involved physical quantities of the employed magnetostrictive material. The nonlinear equivalent circuit is preliminarily validated on a concept device with permanent magnets biasing on a Stress Annealed Galfenol rod. Experimental data with different resistive loads and magnetic biasing are considered and compared with simulation outputs, in terms of the RMS voltage and harvested power.
21
Zhuang, Xin, Chung-Ming Leung, Jiefang Li, and Dwight Viehland. "Estimation of the Intrinsic Power Efficiency in Magnetoelectric Laminates Using Temperature Measurements." Sensors 20, no. 11 (June 11, 2020): 3332. http://dx.doi.org/10.3390/s20113332.
Abstract:
Magnetoelectric (ME) power efficiency is a more important property than the ME voltage or the current coefficients for power conversion applications. This paper introduces an analytical model that describes the relation between the external magnetic field and the power efficiency in layered ME composites. It is a two-phase model. The first fragment establishes the expression between the magnetic field strength and the temperature increase within an operating period. It uses a magneto-elasto-electric equivalent circuit model that was developed by Dong et al. Following previous investigations; the main loss source is the mechanical power dissipation. The second fragment links the power efficiency and the temperature increase in a heat-balanced system. This method is generally used by researchers in the piezoelectric field. The analytical model and the experimental data shows that the decrease of the power efficiency in a laminated composite is between 5% and 10% for a power density of 10 W/in3 (0.61 W/cm3) to 30 W/in3 (1.83 W/cm3). The failure mechanism/process of ME composites under high power density can be estimated/monitored by the proposed method for ME composites in practical applications.
22
Ostaszewska-Liżewska, Anna, Michał Nowicki, Roman Szewczyk, and Mika Malinen. "A FEM-Based Optimization Method for Driving Frequency of Contactless Magnetoelastic Torque Sensors in Steel Shafts." Materials 14, no. 17 (September 1, 2021): 4996. http://dx.doi.org/10.3390/ma14174996.
Abstract:
This paper presents a novel finite element method (FEM) of optimization for driving frequency in magneto-mechanical systems using contactless magnetoelastic torque sensors. The optimization technique is based on the generalization of the axial and shear stress dependence of the magnetic permeability tensor. This generalization creates a new possibility for the determination of the torque dependence of a permeability tensor based on measurements of the axial stress on the magnetization curve. Such a possibility of quantitative description of torque dependence of a magnetic permeability tensor has never before been presented. Results from the FEM-based modeling method were validated against a real magnetoelastic torque sensor. The sensitivity characteristics of the model and the real sensor show a maximum using a driving current of similar frequency. Consequently, the proposed method demonstrates the novel possibility of optimizing magnetoelastic sensors for automotive and industrial applications.
23
Ikhaddalene, Soumia, Fatima Zibouche, Alain Ponton, Amar Irekti, and Florent Carn. "Synthesis and Rheological Properties of Magnetic Chitosan Hydrogel." Periodica Polytechnica Chemical Engineering 65, no. 3 (May 6, 2021): 378–88. http://dx.doi.org/10.3311/ppch.17148.
Abstract:
The aim of the present work is first to synthesis a magnetic chitosan hydrogel (chitosan ferrogel) using the blending method and second to study it rheological behavior. Magnetic components ( maghemite particles γ-Fe2O3 ) were synthesized via a simple chemical co-precipitation route also called Massart's procedure. Before being dispersed in chitosan network, γ-Fe2O3 particles were covered with a cationic polyelectrolyte (Polydiallyldimethylammonium chloride; PDADMAC) and the exact quantity required to cover the entire surface of maghemite particles was determined by Electrophoretic mobility. The successful functionalization of maghemite particles was confirmed by zeta potential measurement. The prepared ferrogel was gelified using glyoxal as crosslinking agent. The effect of continuous magnetic field on rheological properties of the elaborated ferrogel was studied, under controlled temperature before and after the gelation process, using a rotating rheometer fitted with a new magneto-rheological cell. Moreover the influence of iron oxide content on the gelation time of magnetic hydrogel was studied by comparing two ferrogels with different maghemite particles content. Flow and viscoelastic measurements showed that applying magnetic field facilitates the formation of a new structure (column-like arrangements), which was confirmed by in situ optical microscopic observation. Kinetic study was investigated by mechanical spectroscopy and demonstrates that the gelation time depends on both iron oxides content and magnetic field.
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Koskov, M. A., and A. S. Ivanov. "Magnetic system of uniaxial inertial ferrofluid accelerometer." Vestnik IGEU, no. 6 (December 28, 2022): 26–36. http://dx.doi.org/10.17588/2072-2672.2022.6.026-036.
Abstract:
Today, a physical problem of engineering design of inertial magnetic fluid accelerometers to measure dynamic processes is relevant. The main drawback of modern sensors is the nonlinear characteristic of the forced response, which limits the application area of the sensors to the case of quasi-static action (tilt angle sensor). The reason of nonlinearity is the design of the magneto-mechanical system of the elastic suspension of the inertial mass made in the form of a pair of permanent ring magnets. This drawback can be eliminated by designing an axisymmetric electromagnetic system that generates a magnetic field with a linear intensity gradient along the symmetry axis. Thus, the paper is devoted to this problem and experimental approvement of the results on a laboratory sensor prototype. The Monte Carlo algorithm is used to calculate electromagnetic system containing permanent magnets and magnetizing coils. The algorithm is implemented using the C++ programming language. Measurements of the most important parameters of the magnetic field from the point of view of the purpose of the study are carried out on the assembled model of the electromagnetic system of the accelerometer. The calculation of electromagnetic system that generate permanent magnetic field with linear intensity gradient along the symmetry axis is carried out. The applicability of the Monte Carlo method to solve similar engineering problems is shown. The measurements of the magnetic field strength of a given configuration have been made. The force of the magnetic field acting on the test sensitive element with a constant magnetic moment is measured. A comparison of the calculated magnetic field with the field of a real system is carried out. It shows satisfactory agreement between the calculated data and the real ones. A linear dependence of the restoring force on the displacement coordinate of a body with a constant magnetic moment from the equilibrium position is shown. The linearization of the response of the mechanical part of the magnetic fluid accelerometer is achieved by choosing the desired configuration of its electromagnetic system, which allows making reliable measurements of both static and dynamic quantities.
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Burmistrov, Ivan A., Maxim M. Veselov, Alexander V. Mikheev, Tatiana N. Borodina, Tatiana V. Bukreeva, Michael A. Chuev, Sergey S. Starchikov, et al. "Permeability of the Composite Magnetic Microcapsules Triggered by a Non-Heating Low-Frequency Magnetic Field." Pharmaceutics 14, no. 1 (December 28, 2021): 65. http://dx.doi.org/10.3390/pharmaceutics14010065.
Abstract:
Nanosystems for targeted delivery and remote-controlled release of therapeutic agents has become a top priority in pharmaceutical science and drug development in recent decades. Application of a low frequency magnetic field (LFMF) as an external stimulus opens up opportunities to trigger release of the encapsulated bioactive substances with high locality and penetration ability without heating of biological tissue in vivo. Therefore, the development of novel microencapsulated drug formulations sensitive to LFMF is of paramount importance. Here, we report the result of LFMF-triggered release of the fluorescently labeled dextran from polyelectrolyte microcapsules modified with magnetic iron oxide nanoparticles. Polyelectrolyte microcapsules were obtained by a method of sequential deposition of oppositely charged poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate) (PSS) on the surface of colloidal vaterite particles. The synthesized single domain maghemite nanoparticles integrated into the polymer multilayers serve as magneto-mechanical actuators. We report the first systematic study of the effect of magnetic field with different frequencies on the permeability of the microcapsules. The in situ measurements of the optical density curves upon the 100 mT LFMF treatment were carried out for a range of frequencies from 30 to 150 Hz. Such fields do not cause any considerable heating of the magnetic nanoparticles but promote their rotating-oscillating mechanical motion that produces mechanical forces and deformations of the adjacent materials. We observed the changes in release of the encapsulated TRITC-dextran molecules from the PAH/PSS microcapsules upon application of the 50 Hz alternating magnetic field. The obtained results open new horizons for the design of polymer systems for triggered drug release without dangerous heating and overheating of tissues.
26
Gloria, A., T. Russo, U. D'Amora, S. Zeppetelli, T. D'Alessandro, M. Sandri, M. Bañobre-López, et al. "Magnetic poly(ε-caprolactone)/iron-doped hydroxyapatite nanocomposite substrates for advanced bone tissue engineering." Journal of The Royal Society Interface 10, no. 80 (March 6, 2013): 20120833. http://dx.doi.org/10.1098/rsif.2012.0833.
Abstract:
In biomedicine, magnetic nanoparticles provide some attractive possibilities because they possess peculiar physical properties that permit their use in a wide range of applications. The concept of magnetic guidance basically spans from drug delivery and hyperthermia treatment of tumours, to tissue engineering, such as magneto-mechanical stimulation/activation of cell constructs and mechanosensitive ion channels, magnetic cell-seeding procedures, and controlled cell proliferation and differentiation. Accordingly, the aim of this study was to develop fully biodegradable and magnetic nanocomposite substrates for bone tissue engineering by embedding iron-doped hydroxyapatite (FeHA) nanoparticles in a poly(ε-caprolactone) (PCL) matrix. X-ray diffraction analyses enabled the demonstration that the phase composition and crystallinity of the magnetic FeHA were not affected by the process used to develop the nanocomposite substrates. The mechanical characterization performed through small punch tests has evidenced that inclusion of 10 per cent by weight of FeHA would represent an effective reinforcement. The inclusion of nanoparticles also improves the hydrophilicity of the substrates as evidenced by the lower values of water contact angle in comparison with those of neat PCL. The results from magnetic measurements confirmed the superparamagnetic character of the nanocomposite substrates, indicated by a very low coercive field, a saturation magnetization strictly proportional to the FeHA content and a strong history dependence in temperature sweeps. Regarding the biological performances, confocal laser scanning microscopy and AlamarBlue assay have provided qualitative and quantitative information on human mesenchymal stem cell adhesion and viability/proliferation, respectively, whereas the obtained ALP/DNA values have shown the ability of the nanocomposite substrates to support osteogenic differentiation.
27
Orudzhev, Farid, Nariman Alikhanov, Abdulkarim Amirov, Alina Rabadanova, Daud Selimov, Abdulatip Shuaibov, Rashid Gulakhmedov, et al. "Porous Hybrid PVDF/BiFeO3 Smart Composite with Magnetic, Piezophotocatalytic, and Light-Emission Properties." Catalysts 13, no. 5 (May 11, 2023): 874. http://dx.doi.org/10.3390/catal13050874.
Abstract:
The creation of multi-stimuli-sensitive composite polymer–inorganic materials is a practical scientific task. The combination of photoactive magneto-piezoelectric nanomaterials and ferroelectric polymers offers new properties that can help solve environmental and energy problems. Using the doctor blade casting method with the thermally induced phase separation (TIPS) technique, we synthesized a hybrid polymer–inorganic nanocomposite porous membrane based on polyvinylidene fluoride (PVDF) and bismuth ferrite (BiFeO3/BFO). We studied the samples using transmission and scanning electron microscopy (TEM/SEM), infrared Fourier spectroscopy (FTIR), total transmission and diffuse reflection, fluorescence microscopy, photoluminescence (PL), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), vibrating-sample magnetometer (VSM), and piezopotential measurements. Our results demonstrate that the addition of BFO increases the proportion of the polar phase from 76.2% to 93.8% due to surface ion–dipole interaction. We also found that the sample exhibits laser-induced fluorescence, with maxima at 475 and 665 nm depending on the presence of nanoparticles in the polymer matrix. Furthermore, our piezo-photocatalytic experiments showed that under the combined actions of ultrasonic treatment and UV–visible light irradiation, the reaction rate increased by factors of 68, 13, 4.2, and 1.6 compared to sonolysis, photolysis, piezocatalysis, and photocatalysis, respectively. This behavior is explained by the piezoelectric potential and the narrowing of the band gap of the composite due to the mechanical stress caused by ultrasound.
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Wang, Shudan, Mingzhi Guan, Jiaxiang Chen, Xingzhe Wang, and Youhe Zhou. "A visual and full-field method for detecting quench and normal zone propagation in HTS tapes." Superconductor Science and Technology 35, no. 2 (December 29, 2021): 025010. http://dx.doi.org/10.1088/1361-6668/ac3f9d.
Abstract:
Abstract A fast and effective quench detection method is especially challenging in the development of high-field high-temperature superconducting (HTS) magnets for their safe operations and reliably releasing the stored energy during a quench. The occurrence and propagation of a quench are often accompanied by strong thermal and magneto-mechanical responses within superconducting magnets. Aiming to detect a quench in the whole process and capture the thermoelastic behavior associated with it, a new detection technique with a visual and full-field perception based on the digital image correlation (DIC) method is proposed in the present study. The experiment of a quench triggered thermally by a local spot heater is conducted for a YBCO coated conductor tape in a cryogenic chamber. The evolution and characteristics of the full-field strain in the HTS tape during the processes of a non-quench, a quench occurrence and quench propagation are intuitively presented with experimental observations. For the comparison purpose, the conventional quench detection methods by monitoring temperature and voltage signals during a quench are also utilized experimentally. The results verify the visual and full-field quench detection method, which uses a criterion of thermoelastic strain-rate for the quench occurrence and the evolution of strain contours for the normal zone propagating aspect. Additionally, a numerical quench model of coupled thermoelasticity to simulate the experiment is established and solved with the aid of Comsol multiphysics software. The quantitative results are in good agreement with the experimental measurements to prove the reliability and availability of the developed detection method. Since the DIC method is non-contact and insensitive to intense electromagnetic interferences, it is expected to provide a new technique on quench issues and some basic measurements on strain/stress behaviors in extreme environments of high-field HTS magnets in the future.
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Szymczyk, Wiesław, Anna Boczkowska, Tadeusz Niezgoda, and Konrad Zubko. "Experimental Validation of Numerical Methods of MRE Simulations." Solid State Phenomena 154 (April 2009): 113–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.154.113.
Abstract:
This paper deals with the development of magnetoactive elastomers (MREs) based on the carbonyl iron particles-filled polyurethane resin. Their stiffness can be changed easily by magnetic field. Such a property can be useful in construction of active vibration damping structural elements. For the needs of numerical modelling methods validation the elementary case of the two magnetic particles was investigated experimentally. Special “macro samples” were prepared with pairs of ferromagnetic particles of spherical shape of diameter of 12.7 mm. They provided easy observations and measurements. The gap distance between particles was established on the level of ¼ of the diameter. After application of the magnetic field particles started to attract each other like magnetic dipoles. The mutual displacement of the dipoles was recorded in function of the magnetic field intensity, which was varied in the range100÷300 [mT]. The deformation field was also obtained from the digital image processing (DIC). Then the experiment was simulated numerically with the use of the 3D FEM models. The dipoles were loaded by forces which were increased gradually until displacements reached values that were measured experimentally. Calculations were performed on the MSC Patran-MARC platform. The Neo-Hookean material model was used to describe properties of the resin matrix. Magneto-mechanical coupling was taken into consideration with the use of an iterative method. The results of calculations were compared with the experimental results. The validation of the base modelling concept was successfully completed.
30
Jen, Shien Uang, Chi Ching Liu, and Chen Yi Chuang. "Magneto-Elastic and Mechanical Properties of Fe81-xNixGa19/Si(100) and Fe81-yNiyGa19/Glass Films." Advanced Materials Research 705 (June 2013): 66–69. http://dx.doi.org/10.4028/www.scientific.net/amr.705.66.
Abstract:
Two series of Fe81-xNixGa19/Si (100) and Fe81-yNiyGa19/glass films, where x or y = 0 26at.%Ni, were made by the magnetron sputtering method. We have performed three kinds of experiments on these films:the saturation magnetostriction (λS); [ii] the nanoindentation; and [iii] magnetic hysteresis-loop measurements. The main findings of this study are summarized below:[ λSreachesa local maximum, when x = 22 and [B] the Youngs modulus, Ef, of the Fe-Ni-Ga film deposited on a Si (100) substrate is larger than that (the same film) deposited on a glass substrate. We conclude thatthe Fe59Ni22Ga19film could beemployed in a low-field and low-costnano-magnetic switching device.
31
Велев, Борис, Иван Иванов, and Владимир Каменов. "Автоматизированная система комплексного неразрушающего контроля структуры и механических свойств материалов машиностроения." Дефектоскопия 3 (March 2021): 17–25. http://dx.doi.org/10.31857/s0130308221030027.
Abstract:
An automated system with two optimized modular devices is presented — MULTITEST-MC010 for research of ferromagnetic materials with the methods for measuring magnetic noise and magneto acoustic emission of Barkhausen and MULTITEST — CD010 for research of mechanical engineering materials with the methods of velocity measurement of longitudinal waves C and attenuation coefficient δof ultrasound. The main approaches and principles for the automated data processing of complex non-destructive testing are presented, as well as the setup of the modular devices of the automated system. For approbation of the system the influence of the heat treatment (hardness) in structural steel 40X on the non-destructive information parameters of the magnetic noise and the magneto acoustic emission — magnetic noise voltage EBN and voltage of the magneto acoustic emission EMAE was studied. The mechanical properties in foundry cast iron samples with complex measurement of the information parameters , C, by simultaneous use of the two modular devices of the system were also studied. The possibility for the complex application of these parameters for non-destructive testing of the mechanical properties after heat treatment in structural steel 40X and the tensile strength in cast iron specimens has been proven.
32
Zeng, Zhoumo, Chengwu Zhao, Xinjing Huang, Jian Li, and Shili Chen. "Non-invasive pressure measurement based on magneto-mechanical effects." Measurement Science and Technology 29, no. 9 (August 14, 2018): 095106. http://dx.doi.org/10.1088/1361-6501/aad60f.
33
Golovin, Igor S. "Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review." Materials 16, no. 6 (March 15, 2023): 2365. http://dx.doi.org/10.3390/ma16062365.
Abstract:
Fe–Ga alloys (GalFeNOLs) are the focus of attention due to their enhanced magneto-elastic properties, namely, magnetostriction in low saturation magnetic fields. In the last several years, special attention has been paid to the anelastic properties of these alloys. In this review, we collected and analyzed the frequency-, amplitude-, and temperature-dependent anelasticity in Fe–Ga and Fe–Ga-based alloys in the Hertz range of forced and free-decay vibrations. Special attention is paid to anelasticity caused by phase transitions: for this purpose, in situ neutron diffraction tests with the same heating or cooling rates were carried out in parallel with temperature dependencies measurements to control ctructure and phase transitions. The main part of this review is devoted to anelastic effects in binary Fe–Ga alloys, but we also consider ternary alloys of the systems Fe–Ga–Al and Fe–Ga–RE (RE—Rare Earth elements) to discuss similarities and differences between anelastic properties in Fe–Ga and Fe–Al alloys and effect of RE elements. We report and discuss several thermally activated effects, including Zener- and Snoek-type relaxation, several transient anelastic phenomena caused by phase transitions (D03 ↔ A2, D03 → L12, L12 ↔ D019, D019 ↔ B2, Fe13Ga9 → L12+Fe6Ga5 phases), and their influence on the above-mentioned thermally activated effects. We also report amplitude-dependent damping caused by dislocations and magnetic domain walls and try to understand the paradox between the Smith–Birchak model predicting higher damping capacity for materials with higher saturation magnetostriction and existing experimental results. The main attention in this review is paid to alloys with 17–20 and 25–30%Ga as the alloys with the best functional (magnetostriction) properties. Nevertheless, we provide information on a broader range of alloys from 6 to 45%Ga. Due to the limited space, we do not discuss other mechanical and physical properties in depth but focus on anelasticity. A short introduction to the theory of anelasticity precedes the main part of this review of anelastic effects in Fe–Ga and related alloys and unsolved issues are collected in summary.
34
Ren, Shao Qing, Chun Fu Gao, Peng Huang, Xin Sheng He, Hong Yun Wang, and Wei Zeng Chen. "Research on MRF Shear Stress Measurement Method under Non-Uniform Magnetic." Key Engineering Materials 620 (August 2014): 347–50. http://dx.doi.org/10.4028/www.scientific.net/kem.620.347.
Abstract:
Magnetorheological fluid as an important branch of the emerging intelligent material, its excellent characteristics make it widely used in electrical system and mechanical system. Common MRF system environment is limited to a uniform magnetic field, the practical application process to the vast of magneto rheological characteristics devices has shown the phenomenon, which does not match the uniform magnetic field theory, the reason is that the actual work environment is the non-uniform magnetic [1-2]. To study the characteristics of MRF shear stress in a non-uniform magnetic field, this paper established a non-uniform field magneto-rheological fluid shear stress measurement device. Comparing the experimental shear stress curves with the uniform magnetic field measured shear stress curves, we found that the non-uniform magnetic field strength of the environmental equivalent shear stress values compared with the uniform magnetic field data have large deviation, this indicates that the existing uniform magnetic field theory is not well to explain non-uniform magnetic field shear properties of MRF, we need to build the introduction of non-uniform magnetic field theory.
35
Gleich, Bernhard, Ingo Schmale, Tim Nielsen, and Jürgen Rahmer. "Miniature magneto-mechanical resonators for wireless tracking and sensing." Science 380, no. 6648 (June 2, 2023): 966–71. http://dx.doi.org/10.1126/science.adf5451.
Abstract:
Sensor miniaturization enables applications such as minimally invasive medical procedures or patient monitoring by providing process feedback in situ. Ideally, miniature sensors should be wireless, inexpensive, and allow for remote detection over sufficient distance by an affordable detection system. We analyze the signal strength of wireless sensors theoretically and derive a simple design of high-signal resonant magneto-mechanical sensors featuring volumes below 1 cubic millimeter. As examples, we demonstrate real-time tracking of position and attitude of a flying bee, navigation of a biopsy needle, tracking of a free-flowing marker, and sensing of pressure and temperature, all in unshielded environments. The achieved sensor size, measurement accuracy, and workspace of ~25 centimeters show the potential for a low-cost wireless tracking and sensing platform for medical and nonmedical applications.
36
Ohta, H., Y. Oshima, Y. Inagaki, S. Okubo, M. Kimata, K. Koyama, M. Motokawa, and T. Mori. "Magneto-optical measurements of β-(BEDT-TTF)2AuI2." Synthetic Metals 135-136 (April 2003): 527–28. http://dx.doi.org/10.1016/s0379-6779(02)00718-x.
37
Rasilo, Paavo, Deepak Singh, Juha Jeronen, Ugur Aydin, Floran Martin, Anouar Belahcen, Laurent Daniel, and Reijo Kouhia. "Flexible identification procedure for thermodynamic constitutive models for magnetostrictive materials." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2223 (March 2019): 20180280. http://dx.doi.org/10.1098/rspa.2018.0280.
Abstract:
We present a novel approach for identifying a multiaxial thermodynamic magneto-mechanical constitutive law by direct bi- or trivariate spline interpolation from available magnetization and magnetostriction data. Reference data are first produced with a multiscale model in the case of a magnetic field and uniaxial and shear stresses. The thermodynamic model fits well to the results of the multiscale model, after which the models are compared under complex multiaxial loadings. A surprisingly good agreement between the two models is found, but some differences in the magnetostrictive behaviour are also pointed out. Finally, the model is fitted to measurement results from an electrical steel sheet. The spline-based constitutive law overcomes several drawbacks of analytical approaches used earlier. The presented models and measurement results are openly available.
38
Castro, G. M. B., A. R. Rodrigues, F. L. A. Machado, A. E. P. de Araujo, R. F. Jardim, and A. K. Nigam. "Magneto-impedance measurements in bulk samples of La0.7Ca0.3MnO3 and La0.6Y0.1Ca0.3MnO3." Journal of Alloys and Compounds 369, no. 1-2 (April 2004): 108–11. http://dx.doi.org/10.1016/j.jallcom.2003.09.083.
39
Draganov, Nikola. "ELECTRICAL ENERGY MEASURING MODUL WITH GALVANOMAGNETIC CURRENT TRANSDUCER." Knowledge International Journal 32, no. 3 (July 26, 2019): 345–51. http://dx.doi.org/10.35120/kij3203345d.
Abstract:
In our time, electrical energy has been used in all household and industrial settings. This is achieved by the ability of the device to convert it into another form of energy – mechanical, lifting, light, heat, and many more. etc., and vice versa. Exactly this variety of energy converters enables the development of electronics, communications, transport, health, energy, but also the search for and the creation of new sources and converters known as alternative sources of energy.The generation and consumption of electrical energy does not end there. In order to assess the quantity and quality of the generated electrical energy, special devices known as electric meters are needed. Measurement of electrical energy is important for both households and industry, as well as for its production and efficient use. There are different methods and means for electrical energy measurement. They work on the basis of different physical principles – induction, electromagnetic, galvanomagnetic, etc., but the task of all of them is to show the result of the current and voltage integrated in time.Various methods are known for the basic parameters measurement defining the value of electrical energy (electrical current and voltage). With the development of microelectronics, and in particular of sensor technology, various sensor transducers have been developed to measure electrical energy through a high precision electric circuit using a contact and/or contactless method. One of the most commonly used sensor transducers for measurement of electrical current in modern energy meters are magneto-sensitive ICs. They are characterized by high reliability of the output signal, temperature and electrostatic steadiness and not least a long period of trouble-free operation1. The sensible element in magneto-sensitive ICs is most often a Hall element or a magnetoresistor. It measures the current flowing through the conductor by converting the magnetic field around it into electrical voltage. The advantage of magneto-sensitive ICs is possibility in a semiconductor chip to create sensitive element and a processing and forming signal circuit. This makes the measuring channel more secure and compatible with integrated circuits for processing and transmitting measurement data.The article presents an experimental model of an electronic module for electrical energy measurement in a single phase AC current circuit. The measuring module is realized on the basis of a specialized integrated circuit ADE series of the Analog Device Company for electrical energy measurement and a current channel, realized by a magnetic-sensitive integrated circuit ACS of the Allegro MicroSistem Inc. for electrical current measurement. Presented are a block and schematic circuit diagrams, experimental design and experimental results showing the performance of the device.
40
Lee, Jong S., and Elizabeth N. Its. "Propagation of Rayleigh Waves in Magneto-Elastic Media." Journal of Applied Mechanics 59, no. 4 (December 1, 1992): 812–18. http://dx.doi.org/10.1115/1.2894047.
Abstract:
Propagation of Rayleigh waves in a perfectly conducting elastic half-space in the presence of magnetic fields is considered for a possible application in nondestructive measurements of mechanical and/or electromagnetic parameters in electromagnetic materials. In particular, the dependence of Rayleigh wave velocity on magnetic and elastic parameters of the conducting medium in tangentially and normally oriented primary magnetic fields is investigated. Numerical results for three elastic materials with different elastic parameters are presented for a range of magnetic permeability. It is shown that the effect of magnetic fields render the medium essentially anisotropic and that the magnetic permeability of the medium and the orientation of the primary magnetic field strongly affect the Rayleigh wave velocity field.
41
Aurich, Konstanze, Stefan Nagel, Elena Heister, and Werner Weitschies. "Affinity analysis for biomolecular interactions based on magneto-optical relaxation measurements." Nanotechnology 19, no. 50 (November 24, 2008): 505102. http://dx.doi.org/10.1088/0957-4484/19/50/505102.
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Wang, Bochao, and Leif Kari. "Constitutive Model of Isotropic Magneto-Sensitive Rubber with Amplitude, Frequency, Magnetic and Temperature Dependence under a Continuum Mechanics Basis." Polymers 13, no. 3 (February 2, 2021): 472. http://dx.doi.org/10.3390/polym13030472.
Abstract:
A three-dimensional nonlinear constitutive model of the amplitude, frequency, magnetic and temperature dependent mechanical property of isotropic magneto-sensitive (MS) rubber is developed. The main components of MS rubber are an elastomer matrix and magnetizable particles. When a magnetic field is applied, the modulus of MS rubber increases, which is known as the magnetic dependence of MS rubber. In addition to the magnetic dependence, there are frequency, amplitude and temperature dependencies of the dynamic modulus of MS rubber. A continuum mechanical framework-based constitutive model consisting of a fractional standard linear solid (SLS) element, an elastoplastic element and a magnetic stress term of MS rubber is developed to depict the mechanical behavior of MS rubber. The novelty is that the amplitude, frequency, magnetic and temperature dependent mechancial properties of MS rubber are integrated into a whole constitutive model under the continuum mechanics frame. Comparison between the simulation and measurement results shows that the fitting effect of the developed model is very good. Therefore, the constitutive model proposed enables the prediction of the mechanical properties of MS rubber under various operating conditions with a high accuracy, which will drive MS rubber’s application in engineering problems, especially in the area of MS rubber-based anti-vibration devices.
43
Maraytta, N., Y. Skourski, J. Voigt, K. Friese, M. G. Herrmann, J. Perßon, J. Wosnitza, S. M. Salman, and T. Brückel. "Direct measurements of the magneto-caloric effect of MnFe4Si3 in pulsed magnetic fields." Journal of Alloys and Compounds 805 (October 2019): 1161–67. http://dx.doi.org/10.1016/j.jallcom.2019.07.113.
44
Yang, Yuan Yuan, Lei Wang, Jiu Bin Tan, Xiao Yu Zhu, Bo Zhao, Guo Liang Jin, Xi Ping Zhao, and Yong Meng Liu. "Self-Sensing Giant Magnetostrictive Actuator for Active Vibration Isolation." Applied Mechanics and Materials 870 (September 2017): 67–72. http://dx.doi.org/10.4028/www.scientific.net/amm.870.67.
Abstract:
Giant magnetostrictive actuator (GMA) are commonly used in active vibration isolation domain for hight frequency response and large output force. GMA has a nonlinear displacement output when disturbed by vibrations. In order to compensate for the nonlinearity and improve the precision of the system, the critical process is the measurement of external disturbances which can be realized with a bridge circuit based on a traditional equivalent circuit model. However, the sensitivity is restricted because of the integral relationship between the force and the open circuit voltage. In this paper, the conception of the dynamic inductance is proposed to optimize the equivalent circuit model that is based on coupled linear magneto-mechanical constitutive equations. Then the measurement for external forces becomes effective with the improvement in the sensitivity through measuring the dynamic inductance. A dynamic simulation is carried out to test the performance of GMA based on the equivalent circuit model. The external dynamic forces can be accurately detected by calculating the impedances in the self-sensing effect of the Terfenol-D.
45
Koschny, Marco, and Morris Lindner. "Magneto-Optical Sensors Accurately Analyze Magnetic Field Distribution of Magnetic Materials." AM&P Technical Articles 170, no. 2 (February 1, 2012): 13–16. http://dx.doi.org/10.31399/asm.amp.2012-02.p013.
Abstract:
Abstract In 1845, Michael Faraday discovered that light passing through a transparent medium can be altered with an externally applied magnetic field. It is not surprising, given the science and engineering involved, that the ideal medium for observing the Faraday effect and the process by which it is made have only recently been developed. This article explains how magneto-optical sensors make use of advanced materials and processes to harness the Faraday effect, making it possible to see magnetic fields and domains with detailed resolution and instantly obtain flux density measurements over the surface of magnetic materials and magnetized parts.
46
Isarov, Maya, Liang Z. Tan, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Andrew M. Rappe, and Efrat Lifshitz. "Rashba Effect in a Single Colloidal CsPbBr3 Perovskite Nanocrystal Detected by Magneto-Optical Measurements." Nano Letters 17, no. 8 (July 5, 2017): 5020–26. http://dx.doi.org/10.1021/acs.nanolett.7b02248.
47
Kawaguchi, Sara, Kohei Hamada, Hiromi Kobori, Toshifumi Taniguchi, and Tetsuo Shimizu. "Magneto-Conductive and Magnetic Properties in La<sub>1-<i>x</i></sub>Sr<i><sub>x</sub></i>MnO<sub>3 </sub>Thin Films on a-SiO<sub>2</sub> Substrates Produced by Metal Organic Decomposition Method." Key Engineering Materials 978 (March 27, 2024): 61–66. http://dx.doi.org/10.4028/p-gs6nki.
Abstract:
We have studied magneto-conductive and magnetic properties of La1-xSrxMnO3 (LSMO) thin films on a-SiO2 substrates produced by the metal organic decomposition (MOD) method. LSMO thin films for x = 0, 0.15 and 0.3 have been produced in a pure O2 gas atmosphere. Although LaMnO3 (LMO) single crystal is an antiferromagnetic insulator (AFI), LMO thin films we have produced show ferromagnetic metal (FM) properties for suitable heat treatment conditions. We consider that the excess of O2- ions in LMO thin films produced in a pure O2 gas atmosphere induces the strong hole self-doping into those and the LMO thin films change from AFI to FM. Whereas, the ordinary hole doping is also occurred in LSMO thin films at x > 0. Thus, the carrier doping for LSMO thin films at x > 0 is caused by the hole self-doping by O2- ions and the ordinary hole doping by the replacement of La3+ ions by Sr2+ ones. To investigate the crystallographic and surface structures of the LSMO thin films, X-ray diffraction and SEM measurements have been performed, respectively. From the X-ray diffraction measurement, we have found that all LSMO thin films have perovskite structure and are polycrystalline. From the SEM measurement, we have seen that the LSMO thin films are formed of the aggregation of LSMO fine particles. Electrical resistivities (ERs) and magneto-resistivity (MR) ratios of the LSMO thin films have been measured on the temperature dependence (4K-300K). From MR ratio measurements, the coercive forces of them have been obtained as a function of temperature, and the Curie temperatures have been estimated from the temperature dependences of the coercive forces. We have discussed the origin of the magneto-conductive and magnetic properties of LSMO thin films.
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Huang, Wenmei, Zhiyu Xia, Pingping Guo, and Ling Weng. "Analysis and experimental research on high frequency magnetic properties of different magnetostrictive materials under variable temperature conditions." AIP Advances 12, no. 3 (March 1, 2022): 035231. http://dx.doi.org/10.1063/9.0000262.
Abstract:
Magnetostrictive materials have excellent magneto-mechanical properties and are widely used in the field of energy conversion. Temperature has an important influence on the magnetic properties of them. Accurately studying the temperature dependence of magnetostrictive materials is a necessary prerequisite for the design of precision actuators. In this paper, we constructed a high-frequency magnetic property measurement system that can control the temperature. The magnetic characteristics of Terfenol-D, Fe-Ga and Fe-Co were measured at temperatures ranging from 10 °C to 80 °C, the frequencies from 1 kHz to 20 kHz and magnetic induction amplitudes from 0.01 T to 0.07 T. The temperature dependence of the three materials under different exciting conditions was comprehensively compared. The variation trends and temperature sensitivities of the coercivity, permeability, equivalent inductance, equivalent resistance and the magnetic energy losses are analyzed respectively. The results of this paper are oriented to practical engineering applications and can be used for high-frequency loss prediction and temperature control system design.
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Andò, Bruno, Salvatore Baglio, Ruben Crispino, and Vincenzo Marletta. "Polymeric Transducers: An Inkjet Printed B-Field Sensor with Resistive Readout Strategy." Sensors 19, no. 23 (December 3, 2019): 5318. http://dx.doi.org/10.3390/s19235318.
Abstract:
Magnetic field sensors are successfully used in numerous application contexts such as position sensing, speed detection, current detection, contactless switches, vehicle detection, and electronic compasses. In this paper, an inkjet printed magnetic sensor, based on the magneto-mechanical sensing principle, is presented together with a physical model describing its physical behavior and experimental results. The main novelties of the proposed solution consist of its low cost, rapid prototyping (printing and drying time), disposability, and in the use of a commercial low-cost printer. A measurement survey has been carried out by investigating magnetic fields belonging to the range 0–27 mT and for different values of the excitation current forced in the actuation coil. Experimental results demonstrate the suitability of both the proposed sensing strategy and model developed. In particular, in the case of an excitation current of 100 mA, the device responsivity and resolution are 3700 µε/T and 0.458 mT, respectively.
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Mincache, Anuar José, Odair Gonçalves de Oliveira, Lilian Felipe da Silva Tupan, Daniel Matos Silva, Ivair Aparecido dos Santos, and Luiz Fernando Cotica. "Magnetoelectric, magnetodielectric and magneto-impedance couplings in Bi1−xNdxFe0.99Co0.01O3 compounds." Research, Society and Development 10, no. 14 (November 10, 2021): e470101422189. http://dx.doi.org/10.33448/rsd-v10i14.22189.
Abstract:
In this work Bi1−xNdxFe0.99Co0.01O3 ceramics compositions were synthesized for x = 0.05, 0.20 and, y = 0.01. Structural refinement results show that most of the samples crystallized in a rhombohedral symmetry with R3c. Measurements magnetoelectric coefficient, show that the magnetoelectric coefficients are of second order. The electrical impedance characterization of in function external magnetic fields, has a relative variation of the real dielectric response, the loss tangent and the electrical impedance. The systems, as the DC magnetic field strength increased a gain in both the values of the dielectric constant variation, as well as the variation of the electrical impedance. In other words, the greater the intensity of the magnetic field, the greater your response. There were also significant variations with of the magnetic field AC.