Investigations on magnetization reversal processes in oriented sintered Nd-Fe-B alloys
Investigations on magnetization reversal processes in oriented sintered Nd-Fe-B alloys
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DOI：
10.1016/0304-8853(91)90012-y
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发表时间：
1991-04
影响因子：
2.7
通讯作者：
G. Ru-wei;L. Hua;Jiang Shou-Ting;Mei Liang-mo;Qiu Meiying
中科院分区：
文献类型：
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作者：
G. Ru-wei;L. Hua;Jiang Shou-Ting;Mei Liang-mo;Qiu Meiying
利用Nd2Fe14B的本征参数（晶格常数、原子磁矩、居里温度、自发磁化强度和磁晶各向异性常数）计算了Nd2Fe14B的磁畴结构（畴壁能量密度、畴壁厚度、畴宽度和单畴颗粒临界直径）。本文详细研究了取向烧结Nd-Fe-B磁体在易磁化方向饱和磁化后的四个阶段的磁化反转过程。结果表明，硬磁相Nd2Fe14B晶粒表层反磁化核的形核以及从晶粒表面到内部的不可逆磁畴壁运动是控制Nd-Fe-B合金内禀矫顽力的主导因素。
Calculations of the magnetic domain structure (domain wall energy density, domain wall thickness, domain width and critical diameter of single domain particles) in Nd2Fe14B have been made by using its intrinsic parameters (lattice constants, magnetic moments of the atoms, Curie temperature, spontaneous magnetization and magneto-crystalline anisotropy constant). The four stages of magnetization reversal processes in oriented sintered Nd-Fe-B magnet after saturation magnetization along its easy direction are studied in detail in this paper. The results show that the nucleation of the reverse-magnetization nuclei in the surface layer of the grains of hard magnetic phase Nd2Fe14B, as well as the irreversible domain wall motion from the surface to the inside of the grains are dominant factors controlling the intrinsic coercivity of the Nd-Fe-B alloy.