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Grain-size dependent demagnetizing factors in permanent magnets

机译:永磁体中取决于晶粒尺寸的退磁因子

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摘要

The coercive field of permanent magnets decreases with increasing grain size. The grain size dependence of coercivity is explained by a size dependent demagnetizing factor. In Dy free Nd_2Fe_(14)B magnets, the size dependent demagnetizing factor ranges from 0.2 for a grain size of 55 nm to 1.22 for a grain size of 8300 nm. The comparison of experimental data with micromagnetic simulations suggests that the grain size dependence of the coercive field in hard magnets is due to the non-uniform magnetostatic field in polyhedral grains.
机译:永磁体的矫顽场随着晶粒尺寸的增加而减小。矫顽力的晶粒尺寸依赖性由尺寸依赖性退磁因子解释。在不含Dy的Nd_2Fe_(14)B磁体中,尺寸相关的退磁系数范围从55纳米的0.2到8300 nm的1.22。实验数据与微磁模拟的比较表明,硬磁体中矫顽场的晶粒尺寸依赖性是由于多面体晶粒中的静磁场不均匀所致。

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  • 来源
    《Journal of Applied Physics》 |2014年第23期|233903.1-233903.7|共7页
  • 作者单位

    Department of Technology, St Poelten University of Applied Sciences, Matthias Corvinus-Str. 15, 3100 St Poelten, Austria;

    Department of Technology, St Poelten University of Applied Sciences, Matthias Corvinus-Str. 15, 3100 St Poelten, Austria;

    Center for Integrated Sensor Systems, Danube University Krems, 2700 Wiener Neustadt, Austria;

    Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria;

    Department of Earth and Environmental Science, Ludwig-Maximilians-Universitaet Muenchen, 80333 Munich, Germany, Fakultaet fuer Physik, Universitaet Duisburg-Essen, 47048 Duisburg, Germany;

    CEMPS, Harrison Building, University of Exeter, Exeter EX4 4QF, United Kingdom;

    Department of Physics and Astronomy, UC Davis, One Shields Avenue, Davis, California 95616, USA;

    Toyota Motor Corp., Toyota City 471-8572, Japan;

    Toyota Motor Corp., Toyota City 471-8572, Japan;

    Toyota Motor Corp., Toyota City 471-8572, Japan;

    Toyota Motor Corp., Toyota City 471-8572, Japan;

    Toyota Motor Corp., Toyota City 471-8572, Japan;

    Toyota Motor Corp., Toyota City 471-8572, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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