Grain-size dependent demagnetizing factors in permanent magnets
Grain-size dependent demagnetizing factors in permanent magnets
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DOI：
10.1063/1.4904854
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发表时间：
2014-12-21
影响因子：
3.2
通讯作者：
Manabe, A.
中科院分区：
文献类型：
--
作者：
Bance, S.;Seebacher, B.;Manabe, A.
永磁体的矫顽力场随晶粒尺寸的增大而减小。矫顽力与晶粒尺寸的关系可以用晶粒尺寸相关的退磁因子来解释。在无Dy的Nd2Fe14B磁体中，尺寸相关的退磁因子范围从晶粒尺寸为55nm的0.2到晶粒尺寸为8300 nm的1.22。实验数据与微磁模拟结果的比较表明，硬磁体中矫顽力场对晶粒尺寸的依赖是由于多面体晶粒中的不均匀静磁场。(C) 2014 AIP出版有限责任公司
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 Nd2Fe14B magnets, the size dependent demagnetizing factor ranges from 0.2 for a grain size of 55nm 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. (C) 2014 AIP Publishing LLC.