Artykuły w czasopismach: „Magnetic properties of material”

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Olekšáková, D. "Analysis of selected properties of powdered compacts". IOP Conference Series: Materials Science and Engineering 1199, nr 1 (1.11.2021): 012033. http://dx.doi.org/10.1088/1757-899x/1199/1/012033.

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Abstract Magnetic materials are large and specific group of materials with interesting properties and useful applications. Some of them have been known for many years, but many important materials have only been discovered in recent decades. It can be expected that many newly discovered materials with specific properties will soon be used in applications in which magnetic materials have been used for a long time, but their properties will be better. The development of new magnetic materials will certainly bring the possibility of their use in such applications in which they have not been used before. This paper contains the review of the results of research focused on the study of soft magnetic ferromagnetic materials. Specifically, they are materials of chemical composition Fe19Ni81 (called Permalloy) and Fe16Ni79Mo5 (called Supermalloy). These materials were prepared in the form of powders by the technique of the mechanical milling. Subsequently, these powders were compacted with aim to prepare a compacted material of the desired shape and size with excellent magnetic properties. This research was focused on the study of the structure and magnetic properties of massive magnetic materials prepared by the compaction of the powders in order to prepare soft magnetic material with excellent properties competing with the material used so far.

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Devine, Michael K. "The magnetic detection of material properties". JOM 44, nr 10 (październik 1992): 24–30. http://dx.doi.org/10.1007/bf03223167.

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Krylov, V. P. "Modelling of electromagnetic properties of multicomponent material". Industrial laboratory. Diagnostics of materials 84, nr 7 (8.08.2018): 38–41. http://dx.doi.org/10.26896/1028-6861-2018-84-7-38-41.

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Current theories of heterogeneous media consider non-uniform materials as natural and artificially synthesizable structures. Nowadays, synthesis of the non-uniform multicomponent materials with given electrodynamic properties and characterized by magnetic and dielectric permeability, is gaining increasing development. When modeling a multicomponent structure as a uniform material with effective dielectric permeability (ignoring the magnetic properties) using the developed models for the components with known dielectric permeability, the errors arise in calculation of the transmission coefficient of a plane wave through the antenna dome wall. We present a heuristic model based on the laws of optics which is intended for simultaneous determination of the effective magnetic and dielectric permeability of multicomponent material in contrast to known models describing statistically non-uniform media only for one electrodynamic parameter. The electrodynamic model developed for description of the effective magnetic and dielectric permeability of non-uniform material suggests a possibility of characterizing a polarized material with the total dipole moment arising in alternating field and expressing the Brewster angle as a the sum of the polarization angles proportional to volume content the mixture components.

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Guo, Y. G., J. G. Zhu, Z. W. Lin i J. J. Zhong. "3D vector magnetic properties of soft magnetic composite material". Journal of Magnetism and Magnetic Materials 302, nr 2 (lipiec 2006): 511–16. http://dx.doi.org/10.1016/j.jmmm.2005.10.019.

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Hu, Yujun, Hongjin Zhao, Xuede Yu, Junwei Li, Bing Zhang i Taotao Li. "Research Progress of Magnetic Field Regulated Mechanical Property of Solid Metal Materials". Metals 12, nr 11 (20.11.2022): 1988. http://dx.doi.org/10.3390/met12111988.

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During the material preparation process, the magnetic field can act with high intensity energy on the material without contact and affect its microstructure and properties. This non-contact processing method, which can change the microstructure and properties of material without affecting the shape and size of products, has become an important technical means to develop new materials and optimize the properties of materials. It has been widely used in scientific research and industrial production. In recent years, the magnetic field assisted processing of difficult-to-deform materials or improving the performance of complex and precision parts has been rapidly and widely concerned by scholars at home and abroad. This paper reviews the research progress of magnetic field regulating the microstructure, and properties of solid metal materials. The effects of magnetic field-assisted heat treatment, magnetic field assisted stretching, and magnetic field independent treatment on the microstructure and properties of solid metal materials are introduced. The mechanism of the magnetic field effect on the properties of metal materials is summarized, and future research on the magnetic field effect on solid metal has been prospected.

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Riabchykov, Mykola, Alexandr Alexandrov, Roman Trishch, Anastasiia Nikulina i Natalia Korolyova. "Prospects for the Development of Smart Clothing with the Use of Textile Materials with Magnetic Properties". TEKSTILEC 65, nr 1 (1.03.2022): 36–43. http://dx.doi.org/10.14502/tekstilec.65.2021050.

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The article studies the properties of textile materials filled with magnetite nanoparticles. These materials have great prospects for creating smart clothes. They have both magnetic and hygienic properties. Chemical transformations in the production of magnetic nanopowder are described. The end product of the process is a mixture of oxides of divalent and ferric iron. The resulting mixture has magnetic properties. Conducted micro and macro experiments showed sufficient adhesion retention strength of magnetite nanoparticles in a textile material. Microscopic studies of the attachment of magnetic particles to the fibers of a textile material have been conducted. The data obtained in express mode allow us to determine the average mass of a magnetic particle in a textile material, the total number of nanoparticles, and, accordingly, to predict the magnetic force that a textile material saturated with magnetite can possess. The existence of the magnetic properties of a textile material filled with magnetite nanoparticles has been proven. A mathematical model of the dependence of the magnetic attraction force of a textile material on the distance and the number of abrasion cycles has been developed. The directions of the use of magnetic textile materials for the creation of smart clothes are proposed. Potential uses for such materials include sportswear and textiles for the disabled. The developed methods can predict the magnetic strength of the obtained textile materials and evaluate their resistance, which is necessary in the development of smart clothing elements based on these materials.

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Azmi, Annur Azlin, i SITI AMIRA OTHMAN. "Effect of Ferrite as Filler in Sugarcane Bagasse Paper via Irradiation Method". Key Engineering Materials 908 (28.01.2022): 441–47. http://dx.doi.org/10.4028/p-602ji8.

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Deforestation issues increased dramatically every year specially to produce paper. Therefore, to supplement the limited wood fibre resources, non-wood fibres especially sugarcane bagasse introduced an alternatives resolve for raw material is considered in paper-based industries. This study addresses the analysis of magnetic sugarcane bagasse materials as substitute fibres in papermaking. Paper is generally made with cellulose fibre which has some specific features used for educational, packaging, and cleaning purposes. Sugarcane bagasse (Saccarhumofficinarum) is popular for its cellulose, holocellulose, and lignin that far more convenient than wood fibres. Meanwhile, the demands of magnetic material in magnetic papermaking industry has increased due to its excellent mechanical characteristics. As the magnetic paper shows some superiority in properties such as renewable use and folding resistance. The used of filler in this study is to alter the properties such as texture, opacity, brightness, dimensional stability, and overall printability. Thus, the used of ferrite (Fe) magnet as a filler can enhance the paper properties. Ferrite is recognized as a hard-magnetic material with distinct properties such as good mechanical hardness and chemical stability, therefore it is a much more convenient material for magnetic paper production. Through the observation under Scanning Electron Microscope (SEM), the image obtained shows that magnetics sugarcane bagasse paper was more convenient to be used as an alternative for paper making. Next, Fourier-Transform Infrared Spectroscopy (FTIR) recognizes the presence of a functional group of the magnetics sugarcane bagasse paper. Moreover, the chemical properties obtained from this study show that the magnetics sugarcane bagasse was as good as the commercial paper available in the industries. To increase the integrity of the paper, the radiation process by using gamma-ray was done to the paper to see the different for pre and post radiation.

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Bunge, H. J., H. J. Kopineck i F. Wagner. "On-line Texture Analysis for Magnetic Property Control". Textures and Microstructures 11, nr 2-4 (1.01.1989): 261–67. http://dx.doi.org/10.1155/tsm.11.261.

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Magnetic properties of hard and soft magnetic materials are strongly anisotropic, i.e. they depend on the crystal direction in which they are being considered. Technological materials are usually polycrystalline. Hence, their properties are orientation mean values of the properties of the crystallites with the texture of the material as the weight function. Inspection and control of magnetic properties of materials thus requires inspection and control of the materials texture which can be carried out off-line by taking samples from the finished material and investigating them in the laboratory. If, however, the texture of the material is to be controlled during the production process then a fast non-destructive on-line texture analyser is required the output signal of which can be used to control the production process.

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Peretyat’ko, P. I., L. A. Kulikov, I. V. Melikhov, Yu D. Perfil’ev, A. F. Pal’, M. A. Timofeev, S. A. Gudoshnikov i N. A. Usov. "Magnetic porous composite material: Synthesis and properties". Technical Physics Letters 41, nr 10 (październik 2015): 974–76. http://dx.doi.org/10.1134/s1063785015100260.

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Sarma, D. D., i Sugata Ray. "Properties of a new magnetic material: Sr2FeMoO6". Journal of Chemical Sciences 113, nr 5-6 (październik 2001): 515–25. http://dx.doi.org/10.1007/bf02708787.

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Wang, S. X., N. X. Sun, M. Yamaguchi i S. Yabukami. "Properties of a new soft magnetic material". Nature 407, nr 6801 (wrzesień 2000): 150–51. http://dx.doi.org/10.1038/35025142.

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Yoshida, Ryo, Jun Kitajima, Takashi Sakae, Mitsuhide Sato, Tsutomu Mizuno, Yuki Shimoda, Akihiro Kubota, Shogo Wada, Teruo Kichiji i Hideo Kumagai. "Effect of Magnetic Properties of Magnetic Composite Tapes on Motor Losses". Energies 15, nr 21 (27.10.2022): 7991. http://dx.doi.org/10.3390/en15217991.

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Alternating current (AC) copper losses in motors increase with carrier frequency of the pulse width modulation (PWM) and are further increased by leakage flux of the permanent magnet. Therefore, AC copper losses increase with motor speed. Conventional techniques for reducing AC copper losses tend to increase other losses. In this paper, AC copper loss was reduced by wrapping a magnetic tape made of a magnetic composite material around the winding. This method controlled the flux path through the winding. Magnetic composite materials are mixtures of magnetic powders and liquid resins whose magnetic properties can be manipulated by changing the combination and other factors. When Fe–Si–Al magnetic tape was wrapped around the winding, the AC copper loss was reduced by 40%. The loss was further reduced by optimizing the magnetic properties of the magnetic composite material. The AC copper loss was maximally reduced when the specific permeability was 100 and the saturation flux density was 1.6. Magnetic tapes composed of magnetic composite materials with high saturation flux density and specific permeability reduce the AC copper losses without increasing other losses in the motor.

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Grua, P. "Dynamic magnetic switch modeling based on static magnetic material properties". Modelling and Simulation in Materials Science and Engineering 1, nr 4 (1.07.1993): 517–28. http://dx.doi.org/10.1088/0965-0393/1/4/013.

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Hasiak, M., A. Łaszcz, A. Żak i J. Kaleta. "Microstructure and Magnetic Properties of NANOPERM-Type Soft Magnetic Material". Acta Physica Polonica A 135, nr 2 (luty 2019): 284–87. http://dx.doi.org/10.12693/aphyspola.135.284.

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Neupane, H. K., A. Rijal i N. P. Adhikari. "Structural, Electronic & Magnetic Properties of Pristine and Defected ZnO Monolayer: First-Principles Study". Journal of Nepal Physical Society 9, nr 1 (25.08.2023): 38–44. http://dx.doi.org/10.3126/jnphyssoc.v9i1.57552.

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Electronic and magnetic properties of materials are appealing properties and have budding applications in the devices. In this work, we have investigated the structural, electronic and magnetic properties of pristine Zinc-Oxide (ZnO) and Oxygen-defected Zinc-Oxide (ZnO_O) materials by spin-polarized density functional theory (DFT) method. Structural properties are studied by calculating their total ground state energy, and found that both are stable 2D materials. It is also found that ZnO have higher stability than of ZnO_O material. Electronic properties of considered materials are examined by analyzing of their band structure, density of states (DOS) calculations and found that ZnO is a direct band gap, n-type semiconductor material in its pristine form and an indirect band gap, p-type semiconductor material in its Oxygen-defected form (ZnO_O). Magnetic properties of pristine and defected ZnO are investigated by analyzing their density of states (DOS) and partial density of states (PDOS) calculations, they revealed that ZnO and ZnO_O have non-magnetic properties.

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Volegova, E. A., T. I. Maslova, V. O. Vas’kovskiy i A. S. Volegov. "Developing a reference material set for the magnetic properties of NdFeB alloy-based hard magnetic materials". Reference materials 15, nr 1 (9.07.2019): 21–27. http://dx.doi.org/10.20915/2077-1177-2019-15-1-21-27.

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Introduction The introduction indicates the need for the use of permanent magnets in various technology fields. The necessity of measuring the limit magnetic hysteresis loop for the correct calculation of magnetic system parameters is considered. The main sources of error when measuring boundary hysteresis loops are given. The practical impossibility of verifying blocks of magnetic measuring systems element-by-element is noted. This paper is devoted to the development of reference materials (RMs) for the magnetic properties of hard magnetic materials based on Nd2Fe14B, a highly anisotropic intermetallic compound.Materials and measuring methods Nd-Fe-B permanent magnets were selected as the material for developing the RMs. RM certified values were established using a CYCLE‑3 apparatus included in the GET 198‑2017 State Primary Measurement Standard for units of magnetic loss power, magnetic induction of constant magnetic field in a range from 0.1 to 2.5 T and magnetic flux in a range from 1·10–5 to 3·10–2 Wb.Results and its discussion Based on the experimentally obtained boundary hysteresis loops, the magnetic characteristics were evaluated, the interval of permitted certified values was set, the measurement result uncertainty of certified values was estimated, the RM validity period was established and the first RM batch was released.Conclusion On the basis of conducted studies, the RM type for magnetic properties of NdFeB alloy-based hard magnetic materials was approved (MS NdFeB set). The developed RM set was registered under the numbers GSO 11059–2018 / GSO 11062–2018 in the State RM Register of the Russian Federation.

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Pandey, Krishna, Lauren Sayler, Rabindra Basnet, Josh Sakon, Fei Wang i Jin Hu. "Crystal Growth and Electronic Properties of LaSbSe". Crystals 12, nr 11 (18.11.2022): 1663. http://dx.doi.org/10.3390/cryst12111663.

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The ZrSiS-type materials have gained intensive attentions. The magnetic version of the ZrSiS-type materials, LnSbTe (Ln = Lanthanide), offers great opportunities to explore new quantum states owing to the interplay between magnetism and electronic band topology. Here, we report the growth and characterization of the non-magnetic LaSbSe of this material family. We found the metallic transport, low magnetoresistance and non-compensated charge carriers with relatively low carrier density in LaSbSe. The specific heat measurement has revealed distinct Sommerfeld coefficient and Debye temperature in comparison to LaSbTe. Such addition of a new LnSbSe selenide compound could provide the alternative material choices in addition to LnSbTe telluride materials.

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Chaurasia, S. K., Ujjwal Prakash, P. S. Misra i K. Chandra. "Fe-P Soft Magnetic Properties of Iron for A.C. Applications". Advanced Materials Research 585 (listopad 2012): 289–93. http://dx.doi.org/10.4028/www.scientific.net/amr.585.289.

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Silicon steels and ferrites dominate soft magnetic materials. However, Soft magnetic materials using powder metallurgical techniques are gaining wide spread use in motor, compressors and other rotating devices. High-density Fe-P soft magnetic materials have been developed using hot powder forging route. It was observed that phosphorous addition (ranging from 0.30P-0.80P) enhances the soft magnetic properties of iron for AC applications. This new soft magnetic material offers many manufacturing advantages. Because of its low eddy current loss, it has good high frequency magnetic properties comparable to other soft magnetic materials. Also, it has been observed that phosphorous addition improves the final density of the resulting product.

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GOLEA, Daniela Georgiana, i Lucian Ștefan COZMA. "THE MAGNETIC PROPERTIES OF MATERIALS AND NEW MILITARY APPLICATIONS OF THEM". SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE 19, nr 1 (31.07.2017): 305–14. http://dx.doi.org/10.19062/2247-3173.2017.19.1.37.

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Nagy, András, i Imre Némedi. "Development of Magnetic Material Testing Equipment". Acta Materialia Transylvanica 3, nr 1 (1.04.2020): 33–37. http://dx.doi.org/10.33924/amt-2020-01-06.

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AbstractThis paper deals with the development of equipment that can accurately determine the magnetic properties of small volume thin plate samples. The alloys to be tested are sheets of amorphous structure, such as Finemet alloy, which has excellent high frequency magnetic properties, making it a good candidate for the construction of high efficiency electric motors. This article discusses the components and operation of the equipment under development, whilst giving a brief overview of the efficiency classification of electric motors and the importance of the emerging efficiency class.

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Szmajnta, K., M. M. Szindler i M. Szindler. "Synthesis and magnetic properties of Fe2O3 nanoparticles for hyperthermia application". Archives of Materials Science and Engineering 2, nr 109 (1.06.2021): 80–85. http://dx.doi.org/10.5604/01.3001.0015.2627.

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Purpose: The main purpose of this publication is to bring closer co-precipitation method of magnetic particles synthesis. Procedure of examining and characterisation of those materials was also shown. Design/methodology/approach: During the work, the properties and possible biomedical application of the material produced were also examined. Surface morphology studies of the obtained particles were made using Zeiss's Supra 35 scanning electron microscope and S/TEM TITAN 80-300 transmission electron microscope. In order to confirm the chemical composition of observed layers, qualitative tests were performed by means of spectroscopy of scattered X-ray energy using the Energy Dispersive Spectrometer (EDS). The Raman spectra of the samples were measured with a InVia Raman microscope by Renishaw. Magnetic properties of hematite nanoparticles were made using VSM magnetometer. Findings: Using VSM magnetometer proved that obtained material is mixture of ferromagnetic and superparamagnetic domain. Practical implications: Magnetic Nanoparticles (MNPs) has been gaining an incrementally increasing interest of scientists in the biomedical areas. Presented materials can be used in the hyperthermia phenomena which can be used in precise cancer treatment. Originality/value: Specific magnetic properties which determinate obtained material to be well for hyperthermia phenomena.

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Matsumoto, K., T. Numazawa, Y. Ura, T. Ujiyama i S. Abe. "Thermal and magnetic properties of regenerator material Gd2O2S". Journal of Physics: Conference Series 897 (wrzesień 2017): 012010. http://dx.doi.org/10.1088/1742-6596/897/1/012010.

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Przybylińska, H., A. Bonanni, A. Wolos, M. Kiecana, M. Sawicki, T. Dietl, H. Malissa i in. "Magnetic properties of a new spintronic material—GaN:Fe". Materials Science and Engineering: B 126, nr 2-3 (styczeń 2006): 222–25. http://dx.doi.org/10.1016/j.mseb.2005.09.015.

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Ogawa, Yuichi, Masamu Naoe, Yoshihito Yoshizawa i Ryusuke Hasegawa. "Magnetic properties of high Fe-based amorphous material". Journal of Magnetism and Magnetic Materials 304, nr 2 (wrzesień 2006): e675-e677. http://dx.doi.org/10.1016/j.jmmm.2006.02.167.

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JAAFAR, ADNAN, SAFWAN AREKAT, AHMED AL-SAIE i MOHAMED BOUOUDINA. "STRUCTURE AND MAGNETIC PROPERTIES OF NANOSIZED BaFe2O4 MATERIAL". International Journal of Nanoscience 09, nr 06 (grudzień 2010): 575–77. http://dx.doi.org/10.1142/s0219581x10007289.

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A mixture of BaO and Fe 2 O 3 was mechanically alloyed followed by subsequent annealing. XRD spectra and magnetization hysteresis curves were obtained for both as-milled and annealed samples. XRD pattern of the as-milled powder indicates the formation of an initial amorphous phase. Upon annealing up to 900°C, the material crystallizes into monoferrite BaFe 2 O 4 phase, accompanied by a dramatic change of the magnetic properties. Moreover, the Ms ≈ 5.8 emu/g , Hc ≈ 1.2 kOe , Mr ≈ 2.4 emu/g and an average crystallites size around 23 nm.

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Turtelli, R. Sato, M. Kriegisch, M. Atif i R. Grössinger. "Co-ferrite – A material with interesting magnetic properties". IOP Conference Series: Materials Science and Engineering 60 (17.06.2014): 012020. http://dx.doi.org/10.1088/1757-899x/60/1/012020.

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Habib, K., K. Moore i R. Nessler. "Properties and structures of a magnetic shielding material". Journal of Materials Science Letters 14, nr 12 (1995): 909–12. http://dx.doi.org/10.1007/bf00639323.

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Olekšáková, Denisa, Peter Kollár i Ján Füzer. "Structure and magnetic properties of powdered and compacted FeNi alloys". Journal of Electrical Engineering 68, nr 2 (28.03.2017): 163–66. http://dx.doi.org/10.1515/jee-2017-0024.

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Abstract The crystalline ferromagnetic alloys are known as materials with excellent soft magnetic properties. These alloys have been intensive studied during last decades due to their mechanical and magnetic properties and they are challenge for scientists to extend research of these materials with the aim to broaden their technical applications. FeNi based alloys exhibit very good soft magnetic properties with near-to-zero magnetostriction. This property renders this material as a potential candidate for a differently of industrial applications.

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Grujic, A., N. Talijan, D. Stojanovic, J. Stajic-Trosic, Z. Burzic, Lj Balanovic i R. Aleksic. "Mechanical and magnetic properties of composite materials with polymer matrix". Journal of Mining and Metallurgy, Section B: Metallurgy 46, nr 1 (2010): 25–32. http://dx.doi.org/10.2298/jmmb1001025g.

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Many of modern technologies require materials with unusual combinations of properties that cannot be met by the conventional metal alloys, ceramics, and polymeric materials. Material property combinations and ranges have been extended by the development of composite materials. Development of Nd-Fe-B/polymer composite magnetic materials has significantly increased interest in research and development of bonded magnets, since particles of Nd-Fe-B alloys are proved to be very suitable for their production. This study investigates the mechanical and magnetic properties of compression molded Nd-Fe-B magnets with different content of magnetic powder in epoxy matrix. Mechanical properties were investigated at ambient temperature according to ASTM standard D 3039-00. The obtained results show that tensile strength and elongation decrease with an increase of Nd-Fe-B particles content in epoxy matrix. The modulus of elasticity increases, which means that in exploitation material with higher magnetic powder content, subjected to the same level of stress, undergoes 2 to 3.5 times smaller deformation. Scanning Electron Microscopy (SEM) was used to examine the morphology of sample surfaces and fracture surfaces caused by the tensile strength tests. The results of SQUID magnetic measurements show an increase of magnetic properties of the investigated composites with increasing content of Nd-Fe-B particles.

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Aguib, Salah, Abdelkader Nour i Toufik Djedid. "A mechanical characterization of electroconductive magnetorheological elastomer and semi-analytical modeling of magnetic force". International Journal of Modern Physics B 33, nr 25 (10.10.2019): 1950290. http://dx.doi.org/10.1142/s0217979219502904.

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Materials with novel properties and compounds of intelligent material combinations are a key to innovation in various successful sectors of the global industry as well as for its export. Magnetorheological elastomer materials have interesting physical properties; most of these properties are modified and adapted under the influence of external parameters such as the magnetic field. In this work, an experimental characterization of the magnetorheological elastomers (MRE) loaded with 20% of the iron particles was made. The results showed that the properties of these materials can be modified very selectively and reversibly under the influence of magnetic field, where the stiffness of the material varies depending on the magnetic field intensity that influences the attractive force between iron particles.

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Gjoka, Margariti, Georgios Sempros, Stefanos Giaremis, Joseph Kioseoglou i Charalampos Sarafidis. "On Structural and Magnetic Properties of Substituted SmCo5 Materials". Materials 16, nr 2 (5.01.2023): 547. http://dx.doi.org/10.3390/ma16020547.

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SmCo5 is a well-established material in the permanent magnet industry, a sector which constantly gains market share due to increasing demand but also suffers from criticality of some raw materials. In this work we study the possibility of replacement of Sm with other, more abundant rare earth atoms like Ce-La. These raw materials are usually called “free” rare-earth minerals, appearing as a by-product during mining and processing of other raw materials. Samples with nominal stoichiometry Sm1−xMMxCo5 (x = 0.1–1.0) were prepared in bulk form with conventional metallurgy techniques and their basic structural and magnetic properties were examined. The materials retain the hexagonal CaCu5-type structure while minor fluctuations in unit cell parameters as observed with X-ray diffraction. Incorporation of Ce-La degrade intrinsic magnetic properties, Curie temperature drops from 920 K to 800 K across the series and mass magnetization from 98 Am2/kg to 60 Am2/kg; effects which trade off for the significantly reduced price. Atomistic simulations, implemented based on Density Functional Theory calculations are used in the case of the stoichiometry with x = 0.5 to calculate atomic magnetic moments and provide additional insight in the complex interactions that dominate the magnetic properties of the material.

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Kovalevskyy, S., i O. Kovalevska. "MAGNETIC RESONANCE PROCESSING OF MATERIALS". Odes’kyi Politechnichnyi Universytet Pratsi 3, nr 62 (grudzień 2020): 29–38. http://dx.doi.org/10.15276/opu.3.62.2020.04.

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Acoustic devices for determining the elasticity modulus based on the measurement of the samples frequency resonant oscillation due to the sample exposure to acoustic waves with consistently changed frequencies. Objective: Development of an algorithm for increasing the hardness of materials due to magnetic resonance imaging. Materials and methods: The paper shows the possibility of using as a uniform flux to influence the volume of thematerial of the magnetic field formed by powerful permanent magnets. The process of influencing the volume of material of the experimental samples was that the effect of a uniform magnetic flux permeating the sample is initiated in a result of resonant oscillations of the sample caused by broadband exposure of equal amplitude using a “white noise” generator and a piezoelectric emitter. Results: Treatment of samples of materials placed in a uniform magnetic field, resonant polyfrequency vibrations with nanoscale amplitude in the range of 20...80 nm, allows you to change the viscosity of the material, the modulus of elasticity of the material and the hardness of material samples to improve the performance of these materials . Conclusions: Nanoscale amplitudes of natural oscillations of objects of complex shape in energy fields, which include uniform magnetic fields, can correct the physical and mechanical properties of materials of such objects in order to achieve their identity or add strictly defined properties.

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Syrotyuk, Stepan. "The spin-polarized electronic and magnetic properties of zinc selenide heavy doped with chromium". Computational Problems of Electrical Engineering 11, nr 1 (25.04.2021): 28–31. http://dx.doi.org/10.23939/jcpee2021.01.028.

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Atthe first stage, the structureof theZnSe crystal doped with chromium atoms (ZnCrSe)has been found by optimization procedure. At the second stage, the electronic properties of this material have been evaluated within the two approaches. The exchange-correlation functionals used here are based on the generalized gradient approximation (GGA) and the hybrid functional PBE0. The GGA approach provides the metallic state for electrons with the spin up, and for opposite spin orientation the material ZnCrSe bahaves as semiconductor, with the band gap of 2.48 eV. The hybrid functional approach also gives a gapless state for a spin up electron states, and for a spin down it provides the forbidden gap value of 2.39 eV. The magnetic moment of the unit cell, found with the two functionals, is the same and equals to 4 Bμ(Bohr magnetons). So, the calculations with the two exchange-correlation functionals provide the prediction of half-metallic properties of the ZnCrSe material, which is an interesting candidate for spintronic applications.

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Dragoshanskii, Yu N., V. V. Shulika, A. P. Potapov i V. F. Tiunov. "Domain Structure and Properties of Soft Magnetic Iron- Based Alloys with Different Magnetic Treatment". Solid State Phenomena 168-169 (grudzień 2010): 219–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.168-169.219.

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The paper deals with the domain structure and electromagnetic characteristics of soft magnetic iron-based alloys, which are formed by the impact of thermomagnetic treatment (TMT) - cooling of the material in the presence of a magnetic field. The effect of reducing the specific magnetic loss in materials, using a constant or alternating (different frequency) magnetic field is determined. It is shown that the minimum magnetic losses in the materials are obtained after TMT in an alternating magnetic field at high (~ 80 kHz) frequencies. This shows up the perspectives of TMT of soft magnets.

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Nayak, Amrita, S. K. Patri, P. L. Deepti i B. Behera. "Electrical and Magnetic Properties of Pb0.8La0.2Fe0.1Cr0.1Ti0.8O3". Integrated Ferroelectrics 201, nr 1 (2.09.2019): 43–54. http://dx.doi.org/10.1080/10584587.2019.1668689.

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The dielectric spectroscopy of a new ceramic material; Pb0.8La0.2Fe0.1Cr0.1Ti0.8O3 has been studied. The compound was prepared by solid-state reaction method. The structural study from X-ray diffraction technique shows the formation of polycrystalline sample with orthorhombic crystal system at room temperature. Dielectric property of this material has been characterized in the temperature range of 25–450°C and frequency range of 100 Hz – 1 MHz respectively. The phase transition temperatures were at two different temperatures for each frequency. The nature of ac conductivity shows the negative temperature coefficient of resistance type behavior of the material.

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Piraux, Luc. "Magnetic Nanowires". Applied Sciences 10, nr 5 (6.03.2020): 1832. http://dx.doi.org/10.3390/app10051832.

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Magnetic nanowires are attractive materials because of their morphology-dependent remarkable properties suitable for various advanced technologies in sensing, data storage, spintronics, biomedicine and microwave devices, etc. The recent advances in synthetic strategies and approaches for the fabrication of complex structures, such as parallel arrays and 3D networks of one-dimensional nanostructures, including nanowires, nanotubes, and multilayers, are presented. The simple template-assisted electrodeposition method enables the fabrication of different nanowire-based architectures with excellent control over geometrical features, morphology and chemical composition, leading to tunable magnetic, magneto-transport and thermoelectric properties. This review article summarizing the work carried out at UCLouvain focuses on the magnetic and spin-dependent transport properties linked to the material and geometrical characteristics.

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Neupane, Hari Krishna, i Narayan Prasad Adhikari. "Structural, Electronic and Magnetic Properties of Defected Water Adsorbed Single-Layer MoS2". Journal of Institute of Science and Technology 26, nr 1 (17.06.2021): 43–50. http://dx.doi.org/10.3126/jist.v26i1.37817.

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Water adsorbed in MoS2 (wad-MoS2), 1S atom vacancy defect in wad-MoS2 (1S-wad-MoS2), 2S atoms vacancy defects in wad-MoS2 (2S-wad-MoS2), and 1Mo atom vacancy defect in wad-MoS2 (Mo-wad-MoS2) materials were constructed, and their structural, electronic, and magnetic properties were studied by spin-polarized density functional theory (DFT) based first-principles calculations. The wad-MoS2, 1S-wad-MoS2, 2S-wad-MoS2, and Mo-wad-MoS2 materials were found stable. From band structure calculations, wad-MoS2, 1S-wad-MoS2 and 2S-wad-MoS2 materials open energy bandgap of values 1.19 eV, 0.65 eV and 0.38 eV respectively. Also, it was found that the conductivity strength of the material increases with an increase in the concentration of S atom vacancy defects in the structure. On the other hand, the Mo-wad-MoS2 material has metallic properties because energy bands of electrons crossed the Fermi energy level in the band structure. For the investigation of magnetic properties, the density of states (DoS) and partial density of states (PDoS) calculations were used and found that wad-MoS2, 1S-wad-MoS2, and 2S-wad-MoS2 are non-magnetic materials, while Mo-wad-MoS2 is a magnetic material. The total magnetic moment of Mo-wad-MoS2 has a value of 2.66 µB/cell, due to the arrangement of unpaired up-spin and down-spin of electrons in 3s & 3p orbitals of S atoms; and 4p, 4d & 5s orbitals of Mo atoms in the material.

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Grujić, Aleksandar, Dragutin Nedeljković, Jasna Stajić-Trošić, Mirko Z. Stijepović, Sabla Alnouri i Srdjan Perišić. "Magneto-Mechanical and Thermal Properties of Nd-Fe-B-Epoxy-Bonded Composite Materials". Polymers 15, nr 8 (14.04.2023): 1894. http://dx.doi.org/10.3390/polym15081894.

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Polymer-bonded magnets are a class of composite material that combines the magnetic properties of metal particles and the molding possibility of a polymeric matrix. This class of materials has shown huge potential for various applications in industry and engineering. Traditional research in this field has so far mainly focused on mechanical, electrical or magnetic properties of the composite, or on particle size and distribution. This examination of synthesized Nd-Fe-B-epoxy composite materials includes the mutual comparison of impact toughness, fatigue, and the structural, thermal, dynamic-mechanical, and magnetic behavior of materials with different content of magnetic Nd-Fe-B particles, in a wide range from 5 to 95 wt.%. This paper tests the influence of the Nd-Fe-B content on impacting the toughness of the composite material, as this relationship has not been tested before. The results show that impact toughness decreases, while magnetic properties increase, along with increasing content of Nd-Fe-B. Based on the observed trends, selected samples have been analyzed in terms of crack growth rate behavior. Analysis of the fracture surface morphology reveals the formation of a stable and homogeneous composite material. The synthesis route, the applied methods of characterization and analysis, and the comparison of the obtained results can provide a composite material with optimum properties for a specific purpose.

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Srivani, Alla. "Spintronics and Optical Properties of Advanced Bio Materials". Radiology Research and Diagnostic Imaging 2, nr 1 (9.02.2023): 01–05. http://dx.doi.org/10.58489/2836-5127/009.

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Spintronics is an interactive combination of electronics and magnetics that has grown in popularity in the twenty-first century as nanotechnology has advanced. Spintronics is a new type of electronics that employs mutual control of magnetic and other physical signals, such as electrical and optical signals. Spin current has recently received a lot of attention as a basic idea in spintronics. Understanding spin current entails deciphering the mechanisms underlying the mutual control of diverse physical signals, which should lead to future advances in spintronics. The notion of spin current and its historical context are discussed first in this chapter, followed by a discussion of innovative materials for spintronics. Much attention is also dedicated to the physical phenomena that result from the coupling of spins.

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BÖSE, HOLGER. "VISCOELASTIC PROPERTIES OF SILICONE-BASED MAGNETORHEOLOGICAL ELASTOMERS". International Journal of Modern Physics B 21, nr 28n29 (10.11.2007): 4790–97. http://dx.doi.org/10.1142/s0217979207045670.

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Magnetorheological (MR) elastomers are composite materials consisting of magnetic particles in elastomer matrices, whose mechanical properties can be influenced by applying a magnetic field. Main parameters which determine the behavior of these smart materials are the concentration of the magnetic particles and the mechanical stiffness of the elastomer matrix. The viscoelastic properties of silicone-based MR elastomers are outlined in terms of their storage and loss moduli. The mechanical behavior of the material is also influenced by a magnetic field during the curing of the elastomer matrix, which leads to materials with anisotropic microstructures. The storage modulus of soft elastomer matrix composites can be increased in the presence of a magnetic field by significantly more than one order of magnitude or several hundreds of kPa. The relative increase exceeds that of all previously reported data. A shape memory effect, i. e. the deformation of an MR elastomer in a magnetic field and its return to original shape on cessasion of the magnetic field, is described.

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Chiba, Akira, K. Ooyabu, Yasuhiro Morizono, Tomoyuki Maeda, Shinya Sugimoto, T. Kozuka, E. Kakimoto, Koichi Kawahara i T. Watanabe. "Shock Consolidation of Sm-Fe-N Magnetic Powders and Magnetic Properties". Materials Science Forum 449-452 (marzec 2004): 1037–40. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.1037.

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Sm2Fe17Nx compound is a prospective candidate as a material for high performance permanent magnets because of its good intrinsic magnetic properties with a Curie temperature of 747K, a room-temperature anisotropy field of 14T and a room-temperature saturation magnetization of 1.5T. However, Sm2Fe17Nx compound decomposes to -Fe and Sm nitride above 873K and conventional powder metallurgy processing techniques fail to meet the processing requirements. Shock consolidation is a viable alternative to process this compound. Fully dense Sm2Fe17Nx bulk materials were fabricated by cylindrical explosive consolidation technique using water as a pressure transmitting medium. Explosive consolidation is performed under cold state and fully dense materials can be obtained without any degradation of the characteristics of the powder states. Sound compacts were obtained without any cracks or teas, and the value of (BH)max of Sm2Fe17Nx compact is 23.8 MGOe.

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Rademeyer, Melanie, Shalene Bothma, Stefan Coetzee, David Liles, Mark Turnbull i Christopher Landee. "Magneto-structural relationships in Cu(II) containing hybrid materials". Acta Crystallographica Section A Foundations and Advances 70, a1 (5.08.2014): C1370. http://dx.doi.org/10.1107/s205327331408629x.

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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.

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Sietsema, Glade, Tianyu Liu i Michael E. Flatté. "Electric-Field Control of Magnon Gaps in a Ferromagnet using a Spatially-Periodic Electric Field". SPIN 07, nr 03 (wrzesień 2017): 1740012. http://dx.doi.org/10.1142/s2010324717400124.

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The frequencies and linewidths of spin waves in one-dimensional (1D) and two-dimensional (2D) periodic superlattices of magnetic materials are found, using the Landau–Lifshitz–Gilbert equations. The form of the exchange field from a surface-torque-free boundary between magnetic materials is derived, and magnetic-material combinations are identified which produce gaps in the magnonic spectrum across the entire superlattice Brillouin zone for hexagonal and square-symmetry superlattices. The magnon gaps and spin-wave dispersion properties of a uniform magnetic material under the influence of a periodic electric field are presented. Such results suggest the utility of magnetic insulators for electric-field control of spin-wave propagation properties.

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Fernández, Jesús Rodríguez. "Magnetic Properties of Polycrystalline PrCu2: A Quadrupolar Transition Material". Zeitschrift für Naturforschung B 62, nr 7 (1.07.2007): 941–48. http://dx.doi.org/10.1515/znb-2007-0711.

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Abstract Polycrystalline PrCu2, which has a quadrupolar transition at 7.7 K, has been investigated using electrical resistivity, magnetization and dilatometry techniques. To study dilution effects, two solid solutions of PrCu2, (Pr0.8La0.2)Cu2, and (Pr0.8Y0.2)Cu2, were also studied. The quadrupolar transition decreases in temperature with doping, while it increases slightly with the magnetic field. In resistivity and thermal expansion, the magnetic contributions show a clear evidence of crystal field excitations. The analysis of both properties provided benchmark values of the Debye temperature and Grüneisen parameters.

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Ito, Mikiya, Tatsuro Sakamoto i Minoru Suzuki. "Basic Approach to Graded Compound of Magnetic Particle with Polyester Resin in Magnetic Field". Materials Science Forum 631-632 (październik 2009): 161–66. http://dx.doi.org/10.4028/www.scientific.net/msf.631-632.161.

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Functionally Graded Material (FGM) is a characteristic material having many functions and possibilities. The improvement of the long term stability is strongly necessitated by railway polymeric materials. To carry out the purpose, FGM is an expected material that enables to improve the certain properties and affinities. The authors tried to produce a graded compound of the magnetic particles in the polymer matrix in the magnetic field. From the results, the graded compound of the magnetic particles was produced by the control of magnetic flux. In particular, the control of time during which the magnetic field was charged was effective to improve the dispersion state of the magnetic particles in polymer matrix.

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Kukla, Mateusz, Paweł Tarkowski, Jan Górecki, Ireneusz Malujda i Krzysztof Talaśka. "The Effect of Magnetic Field on Magnetorheological Composites - Artificial Neural Network Based Modelling and Experiments". Applied Mechanics and Materials 816 (listopad 2015): 327–36. http://dx.doi.org/10.4028/www.scientific.net/amm.816.327.

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Looking for new applications of the available materials, such as magnetorheological elastomers (MERs) is an important element of machine design process. To this end it is necessary to determine their fundamental mechanical properties, including Young’s modulus and shear modulus. These properties are determined experimentally by testing the material in compression, tension and shear. In the case of the analysed group of materials the above-mentioned constants depend, inter alia, on the parameters of magnetic field acting on them. Therefore, it is necessary to determine the character and the extent of variation of the mechanical properties as a function of the physical constants characterising the active magnetic field, namely magnetic flux and magnetic intensity (field strength).This paper presents the results of static compression tests carried out on magnetorheological elastomers. The parameters measured during the static compression test were force and displacement at a pre-set magnetic flux. The maximum strength of the induced magnetic field was limited by the design parameters of the test set-up. In order to determine the behaviour of the material at greater values of magnetic strength and flux the properties of a real material were modelled with a neural network. The simulation was carried out using a simple, one-layer neural network. The chosen network training approach was error backpropagation. This approach enables approximation and predicting of changes of the properties of the tested material. The output results will enable deriving an analytical model of the tested MREs.

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Blachowicz, Tomasz, i Andrea Ehrmann. "Most recent developments in electrospun magnetic nanofibers: A review". Journal of Engineered Fibers and Fabrics 15 (styczeń 2020): 155892501990084. http://dx.doi.org/10.1177/1558925019900843.

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One-dimensional materials, such as nanowires, nanotubes, or nanofibers, have attracted more and more attention recently due to their unique physical properties. Their large length-to-diameter ratio creates anisotropic material properties which could not be reached in bulk material. Especially one-dimensional magnetic structures are of high interest since the strong shape anisotropy reveals new magnetization reversal modes and possible applications. One possibility to create magnetic nanofibers in a relatively simple way is offered by electrospinning them from polymer solutions or melts with incorporated magnetic nanoparticles. This review gives an overview of most recent methods of electrospinning magnetic nanofibers, measuring their properties as well as possible applications from basic research to single-cell manipulation to microwave absorption.

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Sunar, M. "Modeling of Functionally Graded Thermopiezoelectro-Magnetic Materials". Advanced Materials Research 445 (styczeń 2012): 487–91. http://dx.doi.org/10.4028/www.scientific.net/amr.445.487.

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Previous work has shown the importance of the mechanical behaviour of coatings and thin materals, where the elastic properties vary in depth. Such coatings and materials are investigated under the broad subject of Functionally Graded Materials (FGMs). There has been also a vast interest in the general coupled field analysis of thermopiezomagnetic materials under which smart piezoelectric and magnetostrictive materials can be studied. The smart materials are often bonded as thin films on host structures for the purpose of sensing and/or actuation. This work aims to combine these two important areas of thermopiezoelectro-magnetism and FGMs. The thermopiezoelectro-magnetic materials are modeled using the finite element method assuming variations in material properties similar to FGMs. The resulting equations of modeling are then applied to an example problem in smart material sensing/actuation.

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Fang, Mengqi, i Eui-Hyeok Yang. "Advances in Two-Dimensional Magnetic Semiconductors via Substitutional Doping of Transition Metal Dichalcogenides". Materials 16, nr 10 (12.05.2023): 3701. http://dx.doi.org/10.3390/ma16103701.

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Transition metal dichalcogenides (TMDs) are two-dimensional (2D) materials with remarkable electrical, optical, and chemical properties. One promising strategy to tailor the properties of TMDs is to create alloys through a dopant-induced modification. Dopants can introduce additional states within the bandgap of TMDs, leading to changes in their optical, electronic, and magnetic properties. This paper overviews chemical vapor deposition (CVD) methods to introduce dopants into TMD monolayers, and discusses the advantages, limitations, and their impacts on the structural, electrical, optical, and magnetic properties of substitutionally doped TMDs. The dopants in TMDs modify the density and type of carriers in the material, thereby influencing the optical properties of the materials. The magnetic moment and circular dichroism in magnetic TMDs are also strongly affected by doping, which enhances the magnetic signal in the material. Finally, we highlight the different doping-induced magnetic properties of TMDs, including superexchange-induced ferromagnetism and valley Zeeman shift. Overall, this review paper provides a comprehensive summary of magnetic TMDs synthesized via CVD, which can guide future research on doped TMDs for various applications, such as spintronics, optoelectronics, and magnetic memory devices.

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Zhang, Ya Ping, Han Sheng Li, Bin Zhen, Qin Wu i Chang Hao Liu. "Study on Preparation and Properties of Mesoporous Magnetic Silica". Advanced Materials Research 197-198 (luty 2011): 269–72. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.269.

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Magnetic materials are one of the promising material for their special magnetic properties and other functionalities. A sol-gel process in reverse microemulsion combined with solvent-thermal technique(ME-SG-ST) was developed for synthesizing nano-sized mesoporous SiO2/CoFe2O4(SCF). Fourier transform infrared spectrometry, TG-DSC, X-ray diffraction, TEM, BET specific surface area measurement, N2adsorption-desorption and magnetic analysis were used to characterize the structure and magnetism property. Results showed that spinel CoFe2O4was uniformly dispersed in nanosized SCF particles. The prepared SCF particles possessed mesopore structure and excellent paramagnetism, and will become great promising materials as the supports of catalyst and absorbents for biological and drugs.

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