Статті в журналах: "Magnetic stray field"

1

McDonald, P. J. "Stray field magnetic resonance imaging." Progress in Nuclear Magnetic Resonance Spectroscopy 30, no. 1-2 (March 1997): 69–99. http://dx.doi.org/10.1016/s0079-6565(96)01035-7.

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2

McDonald, P. J., and B. Newling. "Stray field magnetic resonance imaging." Reports on Progress in Physics 61, no. 11 (November 1, 1998): 1441–93. http://dx.doi.org/10.1088/0034-4885/61/11/001.

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3

ZICK, K. "STRAY FIELD MAGNETIC RESONANCE IMAGING." Nondestructive Testing and Evaluation 11, no. 5 (September 1994): 255–60. http://dx.doi.org/10.1080/10589759408956407.

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4

Mallett, M. J. D., M. R. Halse, and J. H. Strange. "Stray Field Imaging by Magnetic Field Sweep." Journal of Magnetic Resonance 132, no. 1 (May 1998): 172–75. http://dx.doi.org/10.1006/jmre.1998.1385.

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5

Koo, Hyun Cheol, Jonghwa Eom, Joonyeon Chang, and Suk-Hee Han. "A spin field effect transistor using stray magnetic fields." Solid-State Electronics 53, no. 9 (September 2009): 1016–19. http://dx.doi.org/10.1016/j.sse.2009.06.006.

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6

Štrac, Leonardo. "Three-Phase Shunts for Stray Magnetic Field." Procedia Engineering 202 (2017): 183–88. http://dx.doi.org/10.1016/j.proeng.2017.09.706.

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7

Kakugawa, S., N. Hino, A. Komura, M. Kitamura, H. Takeshima, T. Yatsuo, and H. Tazaki. "Shielding Stray Magnetic Fields of Open High Field MRI Magnets." IEEE Transactions on Appiled Superconductivity 14, no. 2 (June 2004): 1639–42. http://dx.doi.org/10.1109/tasc.2004.831023.

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8

Kakugawa, S., N. Hino, A. Komura, M. Kitamura, H. Takeshima, T. Yatsuo, and H. Tazaki. "Shielding stray magnetic fields of open high field MRI magnets." IEEE Transactions on Applied Superconductivity 14, no. 2 (2004): 1639–42. http://dx.doi.org/10.1109/tasc.2004.931023.

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9

Saif, A. G. "Distorted flux lines behavior in type II superconducting spherical shell: Application to high temperature superconductor." International Journal of Modern Physics B 02, no. 05 (October 1988): 1121–32. http://dx.doi.org/10.1142/s0217979288001001.

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A model of a type II superconducting grains (of a spherical shell shape) is suggested to verify the properties of distorted flux lines (FLs) in high temperature superconductors (HTS). The magnetic fields distributions and current density are formulated. It will be shown that the magnetic field inside a superconducting region is composed of the penetrating applied field, FLs fields, and a stray field. Outside the superconductor, there is only the applied field and the stray field . However, in the normal interior region (r < a), there is only the stray field. Moreover, the forces on the flux line (FL) segments are completely determined.

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10

Yang, Yong, Ming Zhang, Zhiquan Song, Minxue Xia, Kexun Yu, and Li Jiang. "Stray Magnetic Field Analysis of ITER Poloidal Field Converter Unit." IEEE Transactions on Plasma Science 45, no. 3 (March 2017): 495–500. http://dx.doi.org/10.1109/tps.2017.2655264.

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11

Baltisberger, Jay H., Sabine Hediger, and Lyndon Emsley. "Multi-dimensional magnetic resonance imaging in a stray magnetic field." Journal of Magnetic Resonance 172, no. 1 (January 2005): 79–84. http://dx.doi.org/10.1016/j.jmr.2004.09.019.

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12

Vasyukov, D., L. Ceccarelli, M. Wyss, B. Gross, A. Schwarb, A. Mehlin, N. Rossi, et al. "Imaging Stray Magnetic Field of Individual Ferromagnetic Nanotubes." Nano Letters 18, no. 2 (January 8, 2018): 964–70. http://dx.doi.org/10.1021/acs.nanolett.7b04386.

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13

Barbic, Mladen, and Axel Scherer. "Stray field magnetic resonance tomography using ferromagnetic spheres." Journal of Magnetic Resonance 181, no. 2 (August 2006): 223–28. http://dx.doi.org/10.1016/j.jmr.2006.05.001.

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14

Hoppstädter, D., and U. Netzelmann. "Photothermally modulated stray field imaging of magnetic materials." Applied Physics Letters 65, no. 4 (July 25, 1994): 499–501. http://dx.doi.org/10.1063/1.112306.

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15

Kinchesh, P., A. A. Samoilenko, A. R. Preston, and E. W. Randall. "Stray Field Nuclear Magnetic Resonance of Soil Water." Journal of Environment Quality 31, no. 2 (2002): 494. http://dx.doi.org/10.2134/jeq2002.0494.

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16

Kinchesh, P., A. A. Samoilenko, A. R. Preston, and E. W. Randall. "Stray Field Nuclear Magnetic Resonance of Soil Water." Journal of Environmental Quality 31, no. 2 (March 2002): 494–99. http://dx.doi.org/10.2134/jeq2002.4940.

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17

Amoskov, V., A. Belov, V. Belyakov, Yu Gribov, V. Kukhtin, E. Lamzin, N. Maximenkova, and S. Sytchevsky. "Stray magnetic field produced by ITER tokamak complex." Plasma Devices and Operations 17, no. 4 (December 2009): 230–37. http://dx.doi.org/10.1080/10519990903043599.

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18

Iwamiya, J. H., and S. W. Sinton. "Stray-field magnetic resonance imaging of solid materials." Solid State Nuclear Magnetic Resonance 6, no. 4 (July 1996): 333–45. http://dx.doi.org/10.1016/0926-2040(95)01208-7.

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19

Engel-Herbert, R., and T. Hesjedal. "Calculation of the magnetic stray field of a uniaxial magnetic domain." Journal of Applied Physics 97, no. 7 (April 2005): 074504. http://dx.doi.org/10.1063/1.1883308.

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20

Zhao, Xiaojun, Fanhui Meng, Zhiguang Cheng, Lanrong Liu, Junjie Zhang, and Chao Fan. "Stray-field loss and flux distribution inside magnetic steel plate under harmonic excitation." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 6 (November 6, 2017): 1715–28. http://dx.doi.org/10.1108/compel-12-2016-0569.

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Purpose This paper aims to investigate an efficient approach to model the electromagnetic behaviors and predict stray-field loss inside the magnetic steel plate under 3D harmonic magnetization conditions so as to effectively prevent the structural components from local overheating and insulation damage in electromagnetic devices. Design/methodology/approach An experimental setup is applied to measure all the magnetic properties of magnetic steel plate under harmonic excitations with different frequencies and phase angles. The measurement and numerical simulation are carried out based on the updated TEAM Problem 21 Model B+ (P210-B+), under the 3D harmonic magnetization conditions. An improved method to evaluate the stray-field loss is proposed, and harmonic flux distribution in the structural components is analyzed. Findings The influence of the harmonic order and phase angle on the stray-field loss in magnetic steel components are noteworthy. Based on the engineering-oriented benchmark models, the variations of stray-field losses and magnetic field distribution inside the magnetic components under harmonic magnetization conditions are presented and analyzed in detail. Research limitations/implications The capacity of the multi-function harmonic source, used in this work, was not large enough, which limits the magnetization level. Up to now, further improvements to increase the harmonic source capacity and investigations of the electromagnetic behaviors of magnetic steel components under multi-harmonic and DC-AC hybrid excitations are in progress. Originality/value To accurately predict the stray-field loss in magnetic steel plate, the improved method based on the combination of magnetic measurement and numerical simulation is proposed. The effects of the frequency and phase angle on the stray-field loss are analyzed.

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21

Garrido, Leoncio, and José Sampayo. "Stray-field nuclear magnetic resonance imaging in microgravity conditions." Journal of Applied Physics 103, no. 5 (March 2008): 056105. http://dx.doi.org/10.1063/1.2842406.

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22

Sun, Yan, Chang-Young Lee, Jeong-Min Jo, Jin-Ho Lee, and Young-Jae Han. "Investigation on Stray Magnetic Field of High-Speed Maglev." Journal of international Conference on Electrical Machines and Systems 3, no. 1 (March 1, 2014): 27–31. http://dx.doi.org/10.11142/jicems.2014.3.1.27.

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23

You, Chun-Yeol. "Confined magnetic stray field from a narrow domain wall." Journal of Applied Physics 100, no. 4 (August 15, 2006): 043911. http://dx.doi.org/10.1063/1.2266233.

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24

Benson, T. B., and P. J. Mcdonald. "Profile Amplitude Modulation in Stray-Field Magnetic-Resonance Imaging." Journal of Magnetic Resonance, Series A 112, no. 1 (January 1995): 17–23. http://dx.doi.org/10.1006/jmra.1995.1004.

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25

Belfi, J., G. Bevilacqua, V. Biancalana, R. Cecchi, Y. Dancheva, and L. Moi. "Stray magnetic field compensation with a scalar atomic magnetometer." Review of Scientific Instruments 81, no. 6 (June 2010): 065103. http://dx.doi.org/10.1063/1.3441980.

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26

Jia, Jian Li. "Study on Superposed Magnetic Field ECM of Square Hole." Advanced Materials Research 443-444 (January 2012): 899–904. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.899.

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To improve the Electrochemical Machining accuracy and little stray corrosion of shaping hole, one scheme is adopted to carry on the technical experiment, which inserted the permanent-magnet into the core of cathode in the square hole separately. Compared with the experiment of Electrochemical Machining without magnetic field, the magnet around the core of cathode inlaid with the magnet is in favor of improving machining accuracy under the same processing parameter, and helpful to reduce the stray corrosion.

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27

Huber, Samuel, Jan-Willem Burssens, Nicolas Dupré, Olivier Dubrulle, Yves Bidaux, Gael Close, and Christian Schott. "A Gradiometric Magnetic Sensor System for Stray-Field-Immune Rotary Position Sensing in Harsh Environment." Proceedings 2, no. 13 (December 13, 2018): 809. http://dx.doi.org/10.3390/proceedings2130809.

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Contactless magnetic position sensors are used in countless industrial and automotive applications. However, as a consequence of the electrification trend the sensors can be exposed to parasitic magnetic stray fields, and their desired robustness may be compromised. In this paper we publish for the first time how this challenge is addressed and constructively solved using a complete paradigm change leaving conventional magnetic field measurement behind and entering into the realm of magnetic field gradient measurement. Our novel sensor system consists of an integrated Hall sensor realized in 0.18 μm CMOS technology with magnetic concentrators and a four-pole permanent magnet. The intrinsic angular accuracy was assessed comparing the rotary position of the permanent magnet with the sensor output showing angle errors below 0.3°. Additional end-of-line calibration can be applied using built-in memory and processing capability to further increase the accuracy. Finally, we demonstrate the immunity against stray fields of 4000 A/m which led to errors below 0.1°, corresponding to 0.06% of the sensors fullscale angular range. In conclusion, this novel sensor system offers a compact and flexible solution for stray-field immune rotary position measurement in harsh environment.

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28

Heyder, Andreas, Stefan Steinbeck, Matthaeus Brela, Alexander Meyer, Sandra Abersfelder, and Jörg Franke. "Empirical Analysis of the Effects of Parasitic Magnetic Stray Field on Force Output of Electromagnetic Actuators." Advanced Materials Research 1140 (August 2016): 384–91. http://dx.doi.org/10.4028/www.scientific.net/amr.1140.384.

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Electromagnetic actuators are used in a variety of technical applications especially in the automotive industry. In-line process control methods are an essential component of the Lean and Six Sigma methodology to ensure process quality. However, the current state of the art in process and quality control is largely limited to end-of-line measurements of the force output. Analysing the magnetic stray field is a promising method that can be used to draw conclusions on the properties and defects of the flux-conducting magnetic materials. This phenomenon can potentially be used to identify defects in magnetic actuators thus allowing inline quality-monitoring. In order to realize this feature, patterns in the magnetic stray field of an actuator have to be identified and linked to a specific defect. The resulting challenge is the analysis of large datasets in order to characterize the stray field anomalies. This paper summarizes the results of a study on linear magnetic actuators trying to prove a relationship between parasitic magnetic stray field and the overall force output of an actuator by analysing the data with statistical methods. The findings of this study suggest that certain statistical methods, like regression, are not well suited to build a prediction model for defects in actuators using a similar approach of measuring stray field outside the actuator. This is mainly due to the fact that prerequisites for model building are difficult to full fill within the context of stray field analysis. Nevertheless, the findings also suggest that methods of exploratory data analysis can be used to derive quality relevant information from data of stray field measurements. The paper elaborates on the problem of defining a population, choosing variables for model building, as well as model error.

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29

Dyakin, V. V., and S. L. Kaibicheva. "Stray field of a wedge placed in an external inhomogeneous magnetic field." Russian Journal of Nondestructive Testing 53, no. 6 (June 2017): 444–52. http://dx.doi.org/10.1134/s1061830917060055.

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30

Bezkorovayniy, V. S., V. V. Yakovenko, and Y. V. Livtsov. "DETERMINATION OF HARDENED METAL LAYER THICKNESS USING MAGNETIC METHOD." Journal of the Russian Universities. Radioelectronics, no. 6 (January 18, 2019): 102–10. http://dx.doi.org/10.32603/1993-8985-2018-21-6-102-110.

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The routine method to control metal surface layer is Vickers hardness test method. The existing nondestructive testing methods are based on measuring induction density and other magnetic quantities in magnetizer core. This causes the method error and restricts the ability to determine the structure of the processed material. The paper provides theoretical and experimental investigation of the method for controlling the hardened axis layer parameters by analyzing characteristics of stray magnetic field of the axis magnetized local surface area before and after rouletting. A method is proposed for determining the hardened metal layer thickness of the rolling stock axis, based on measuring the parameters of the magnetized local area stray magnetic field before and after processing. To justify the proposed method, mathematical modeling of stray magnetic field of the axis local magnetized section is performed before and after processing. Inspection for the hardened metal layer is performed using magnetization of the axis local segment with electromagnet, followed by measuring the stray magnetic field strength. The maximum value of the horizontal magnetic force is determined, which is an informative parameter. A mathematical model is developed for the magnetized section magnetic field, the results of numerical and field experiments are presented. The discrepancy between the experimental data and the results of theoretical calculations is estimated. The method makes it possible to control the thickness of the hardened metal layer and the quality of the hardening of the rolling stock axis.

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31

Gider, S., M. Burleson, and I. R. Mcfadyen. "Longitudinal Recording in a Stray Field." IEEE Transactions on Magnetics 42, no. 6 (June 2006): 1703–7. http://dx.doi.org/10.1109/tmag.2006.873704.

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32

Dupre, Nicolas, Yves Bidaux, Olivier Dubrulle, and Gael F. Close. "A Stray-Field-Immune Magnetic Displacement Sensor With 1% Accuracy." IEEE Sensors Journal 20, no. 19 (October 1, 2020): 11405–11. http://dx.doi.org/10.1109/jsen.2020.2998289.

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33

MacDougall, Trevor W., and Ted F. Hutchinson. "Stray magnetic-field response of linear birefringent optical current sensors." Applied Optics 34, no. 21 (July 20, 1995): 4373. http://dx.doi.org/10.1364/ao.34.004373.

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34

Brajon, Bruno, Lorenzo Lugani, and Gael Close. "Hybrid Magnetic–Inductive Angular Sensor with 360° Range and Stray-Field Immunity." Sensors 22, no. 6 (March 10, 2022): 2153. http://dx.doi.org/10.3390/s22062153.

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Magnetic and inductive sensors are the dominant technologies in angular position sensing for automotive applications. This paper introduces a new angular sensor: a hybrid concept combining the magnetic Hall and inductive principles. A magnetic Hall transducer provides an accurate angle from 0° to 180°, whereas an inductive transducer provides a coarse angle from 0° to 360°. For this novel concept, a hybrid target with a magnetic and inductive signature is also needed. Using the two principles at the same time enables superior performances, in terms of range, compactness and robustness, that are not possible when used separately. We realized and characterized a prototype. The prototype achieves a 360° range, has a high accuracy and is robust against mechanical misalignments, stray fields and stray metals. The measurement results demonstrate that the two sensing principles are completely independent, thereby opening the doors for hybrid optimum magnetic–inductive designs beyond the usual trade-offs (range vs. resolution, size vs. robustness to misalignment).

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35

Zhu, Xiaobin, and Peter Grütter. "Imaging, Manipulation, and Spectroscopic Measurements of Nanomagnets by Magnetic Force Microscopy." MRS Bulletin 29, no. 7 (July 2004): 457–62. http://dx.doi.org/10.1557/mrs2004.139.

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AbstractMagnetic force microscopy (MFM) is a well-established technique for imaging the magnetic structures of small magnetic particles. In cooperation with external magnetic fields, MFM can be used to study the magnetization switching mechanism of submicrometer-sized magnetic particles. Various MFM techniques allow the measurement of a hysteresis curve of an individual particle, which can then be compared to ensemble measurements. The advantage of using MFM-constructed hysteresis loops is that one can in principle understand the origin of dispersion in switching fields. It is also possible to directly observe the correlation between magnetic particles through careful imaging and control of the external magnetic field. In all of these measurements, attention needs to be paid to avoid artifacts that result from the unavoidable magnetic tip stray field. Control can be achieved by optimizing the MFM operation mode as well as the tip parameters. It is even possible to use the tip stray field to locally and reproducibly manipulate the magnetic-moment state of small particles. In this article, we illustrate these concepts and issues by studying various lithographically patterned magnetic nanoparticles, thus demonstrating the versatility of MFM for imaging, manipulation, and spectroscopic measurements of small particles.

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36

Wadas, A., and H. J. Hug. "Models for the stray field from magnetic tips used in magnetic force microscopy." Journal of Applied Physics 72, no. 1 (July 1992): 203–6. http://dx.doi.org/10.1063/1.352159.

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37

Cheng, Chih-Wei, Kuan-Ming Chen, Jeng-Hua Wei, Yu-Chen Hsin, Shyh-Shyuan Sheu, Chih-I. Wu, and Yuan-Chieh Tseng. "Stray field and combined effects on device miniaturization of the magnetic tunnel junctions." Journal of Physics D: Applied Physics 55, no. 19 (February 15, 2022): 195002. http://dx.doi.org/10.1088/1361-6463/ac5147.

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Abstract Magneto-static stray field (H stray) interactions become an important issue when perpendicular CoFeB/MgO magnetic tunnel junctions (MTJs) are miniaturized. This raises the issue of which of the two mainstream etching processes, the pillar structure and the step structure, is better able to retain MTJ performance at extremely small scales. In the current study, we first simulated H stray effects as a function of Ruderman–Kittel–Kasuya–Yosida strength within a synthetic antiferromagnetic structure for the two structures. Our results revealed that H stray interactions were less influential (in terms of offset field) in step MTJs than in pillar MTJs during MTJ miniaturization. This is in good agreement with experimental results. This finding is further supported by adding Dzyaloshinskii–Moriya interactions into the free-layer of the two structures. We further simulated thermal stability with the inclusion of H stray for 30 nm MTJs. We found that adding etching damage effects (i.e. assuming both anisotropy constant and saturation magnetization of the free layer had some degree of loss) into the model of the pillar MTJ was necessary to obtain a trend that is close to the experimental results of thermal stability. This information can provide some guidance on the technical choices for the MTJ miniaturization.

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38

Мельников, Г. Ю., В. Н. Лепаловский та Г. В. Курляндская. "Магнитный импеданс пленочных наноструктур для оценки полей рассеяния микрочастиц магнитных композитов". Журнал технической физики 92, № 2 (2022): 321. http://dx.doi.org/10.21883/jtf.2022.02.52024.259-21.

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Longitudinal giant magnetoimpedance effect of [Fe21Ni79/Cu]5/Cu/[Fe21Ni79/Cu]5 film element was investigated depends on stray magnetic field of epoxy magnetic composite with 30 % weight concentration of iron oxide magnetic microparticles. Configuration of an experiment was a model of thrombus detection in a blood vessel. Stray magnetic field was varied by movement of a magnetic composite above the element perpendicular to the long side. Composite was either magnetized or not to the state of remanence. As the magnetic composite approaches the GMI element, MI ratio curves are smoothed and shifted along the field axis and maximum value of the MI ratio decreases. Magnetic properties of magnetic composite and film element were investigated as well.

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39

Wu, Weili, Wenmei Chen, and Lei Li. "Calculation and Analysis of DC Magnetic Bias Current of Urban Main Transformer under the Action of Stray Current." Mobile Information Systems 2021 (July 12, 2021): 1–9. http://dx.doi.org/10.1155/2021/4806136.

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The stray current generated by subway running into the ground makes the main transformer in the urban area in a direct current (DC) bias state. First, the mathematical model of the metro stray current field is established and the Galerkin finite element method is applied to calculate the model. Then, the dynamic model of the stray current-induced geoelectric field under different working conditions is established by using ANSYS software, and the three-dimensional numerical simulation study of the stray current-induced geoelectric field of the subway is carried out. Finally, taking the Urumqi subway in Xinjiang as an example, the stray current-induced geoelectric field is calculated and simulated, and the correctness of the model is verified by comparing with the measured data of DC magnetic bias in the urban substation. The research can provide useful reference for the calculation and treatment of DC bias of the main transformer in the urban area under the action of stray current.

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40

Dobosz, Jakub, Mateusz Bocheński, and Mariusz Semczuk. "Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation." Applied Sciences 11, no. 21 (November 8, 2021): 10474. http://dx.doi.org/10.3390/app112110474.

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In ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization of a modular, analog electronic circuit that enables three-dimensional control of a magnetic field via the amplitude and direction of a current flowing through three perpendicular pairs of coils. Each pair is controlled by one module, and we are able to continuously change the current flowing thorough the coils in the ±4 A range using analog waveforms such that smooth crossing through zero as the current’s direction changes is possible. With the electrical current stability at the 10−5 level, the designed circuit enables state-of-the-art ultracold experiments. As a benchmark, we use the circuit to compensate stray magnetic fields that hinder efficient sub-Doppler cooling of alkali atoms in gray molasses. We demonstrate how such compensation can be achieved without actually measuring the stray fields present, thus speeding up the process of optimization of various laser cooling stages.

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41

Sonntag, Nadja, Birgit Skrotzki, Robert Stegemann, Peter Löwe, and Marc Kreutzbruck. "The Role of Surface Topography on Deformation-Induced Magnetization under Inhomogeneous Elastic-Plastic Deformation." Materials 11, no. 9 (August 23, 2018): 1518. http://dx.doi.org/10.3390/ma11091518.

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It is widely accepted that the magnetic state of a ferromagnetic material may be irreversibly altered by mechanical loading due to magnetoelastic effects. A novel standardized nondestructive testing (NDT) technique uses weak magnetic stray fields, which are assumed to arise from inhomogeneous deformation, for structural health monitoring (i.e., for detection and assessment of damage). However, the mechanical and microstructural complexity of damage has hitherto only been insufficiently considered. The aim of this study is to discuss the phenomenon of inhomogeneous “self-magnetization” of a polycrystalline ferromagnetic material under inhomogeneous deformation experimentally and with stronger material-mechanical focus. To this end, notched specimens were elastically and plastically deformed. Surface magnetic states were measured by a three-axis giant magnetoresistant (GMR) sensor and were compared with strain field (digital image correlation) and optical topography measurements. It is demonstrated that the stray fields do not solely form due to magnetoelastic effects. Instead, inhomogeneous plastic deformation causes topography, which is one of the main origins for the magnetic stray field formation. Additionally, if not considered, topography may falsify the magnetic signals due to variable lift-off values. The correlation of magnetic vector components with mechanical tensors, particularly for multiaxial stress/strain states and inhomogeneous elastic-plastic deformations remains an issue.

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42

Günther, Wulf, and Sybille Flohrer. "Stray field interaction of stacked amorphous tapes." Journal of Magnetism and Magnetic Materials 320, no. 20 (October 2008): e802-e805. http://dx.doi.org/10.1016/j.jmmm.2008.04.173.

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43

Bertelli, Iacopo, Joris J. Carmiggelt, Tao Yu, Brecht G. Simon, Coosje C. Pothoven, Gerrit E. W. Bauer, Yaroslav M. Blanter, Jan Aarts, and Toeno van der Sar. "Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator." Science Advances 6, no. 46 (November 2020): eabd3556. http://dx.doi.org/10.1126/sciadv.abd3556.

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Spin waves—the elementary excitations of magnetic materials—are prime candidate signal carriers for low-dissipation information processing. Being able to image coherent spin-wave transport is crucial for developing interference-based spin-wave devices. We introduce magnetic resonance imaging of the microwave magnetic stray fields that are generated by spin waves as a new approach for imaging coherent spin-wave transport. We realize this approach using a dense layer of electronic sensor spins in a diamond chip, which combines the ability to detect small magnetic fields with a sensitivity to their polarization. Focusing on a thin-film magnetic insulator, we quantify spin-wave amplitudes, visualize spin-wave dispersion and interference, and demonstrate time-domain measurements of spin-wave packets. We theoretically explain the observed anisotropic spin-wave patterns in terms of chiral spin-wave excitation and stray-field coupling to the sensor spins. Our results pave the way for probing spin waves in atomically thin magnets, even when embedded between opaque materials.

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Kushnir, Vasiliy N., Serghej L. Prischepa, Michela Trezza, Carla Cirillo, and Carmine Attanasio. "Superconducting Order Parameter Nucleation and Critical Currents in the Presence of Weak Stray Fields in Superconductor/Insulator/Ferromagnet Hybrids." Coatings 11, no. 5 (April 25, 2021): 507. http://dx.doi.org/10.3390/coatings11050507.

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The stray fields produced by ferromagnetic layers in Superconductor/Insulator/Ferromagnet (S/I/F) heterostructures may strongly influence their superconducting properties. Suitable magnetic configurations can be exploited to manipulate the main parameters of the hybrids. Here, the nucleation of the superconducting phase in an external magnetic field that periodically oscillates along the film width is studied on the base of the numerical solution of the linearized system of Usadel equations. In addition, the effect of the magnetic configuration of the F-layer on the temperature dependence of the critical current density, Jc(T), is investigated in the framework of the Ginzburg–Landau phenomenological theory on the base of the oscillating model of a stray field. By following this approach, the Jc(T) dependence of a Nb/SiO2/PdNi trilayer is reproduced for different magnetic configurations of the PdNi layer.

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45

Landeghem, Maxime Van, Bruno Bresson, Bernhard Blümich, and Jean-Baptiste d’Espinose de Lacaillerie. "Micrometer scale resolution of materials by stray-field Magnetic Resonance Imaging." Journal of Magnetic Resonance 211, no. 1 (July 2011): 60–66. http://dx.doi.org/10.1016/j.jmr.2011.04.002.

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46

Dias, M., J. Hadgraft, P. M. Glover, and P. J. McDonald. "Stray field magnetic resonance imaging: a preliminary study of skin hydration." Journal of Physics D: Applied Physics 36, no. 4 (January 29, 2003): 364–68. http://dx.doi.org/10.1088/0022-3727/36/4/306.

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47

Dou, Yanxin, Liyi Li, Donghua Pan, Zhiyin Sun, and Jianli Liu. "Effects of stray magnetic field on the performance of ion microbeam." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 456 (October 2019): 37–41. http://dx.doi.org/10.1016/j.nimb.2019.06.044.

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48

Crotti, G., M. Chiampi, and D. Giordano. "Estimation of stray parameters of coils for reference magnetic field generation." IEEE Transactions on Magnetics 42, no. 4 (April 2006): 1439–42. http://dx.doi.org/10.1109/tmag.2006.871453.

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49

Arkulis, M. B., N. I. Misheneva, and Yu I. Savchenko. "Studying magnetic stray field at the surface of elastostrained extensive object." Russian Journal of Nondestructive Testing 52, no. 11 (November 2016): 623–26. http://dx.doi.org/10.1134/s1061830916110024.

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50

Bui, V. P., O. Chadebec, L‐L Rouve, and J‐L Coulomb. "Analysis of the stray magnetic field created by faulty electrical machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 27, no. 1 (January 4, 2008): 224–34. http://dx.doi.org/10.1108/03321640810836780.

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