Effect of Intergrain Exchange Interaction on Magnetic Properties in Isotropic Nd-Fe-B Magnets
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概要
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The effect of intergrain exchange and magnetostatic interactions on remanence and coercivity is calculated numerically for an isotropic Nd-Fe-B model magnet composed of 8000 grains. The intergrain exchange interaction affects the magnetizing process markedly when the grain size L is small, but the magnetostatic interaction does not have substantial effects. The calculated remanence which takes the intergrain exchange interaction into account increases with decreasing L from M_s/2 (M_s: the saturation magnetization) to M_s and agrees roughly with the experimental results. The calculated coercivity decreases with decreasing L from 0.48H_A (H_A: the anisotropy field) to 0. Our results suggest that the large remanence above M_s/2 observed experimentally in isotropic Nd-Fe-B magnets can be explained by the intergrain exchange interaction between Nd_2Fe_<14>B grains.
- 社団法人応用物理学会の論文
- 1992-05-15
著者
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INOUE Hiroshi
Department of Internal Medicine, University of Toyama
-
Fukunaga H
Department Of Electrical Engineering And Computer Science Nagasaki University
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Fukunaga Hirotoshi
Department Of Electrical And Electronic Engineering Nagasaki University
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Inoue Hiroshi
Department Of Electrical And Electronic Engineering Akita University
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Inoue Hiroshi
Departmcnt Of Biology Faculty Of Science Kyushu University:(present)department Of Biology Kyushu Den
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