Effect of exchange-coupling interaction on the effective anisotropy in nanocrystalline Nd2Fe14B material
Effect of exchange-coupling interaction on the effective anisotropy in nanocrystalline Nd2Fe14B material
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DOI：
10.1016/j.jmmm.2004.03.039
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发表时间：
2004-10-01
影响因子：
2.7
通讯作者：
Li, XM
中科院分区：
文献类型：
--
作者：
Han, GB;Gao, RW;Li, XM
研究了交换耦合作用对纳米晶Nd_2Fe_（14）B永磁材料有效各向异性的影响。结果表明，晶粒间的交换耦合作用导致有效各向异性常数K-cff随晶粒尺寸减小而减小。K-eff随晶粒尺寸的变化规律与矫顽力的变化规律基本一致。有效各向异性的减小是导致双折射率降低的主要原因。为了获得高的各向异性或磁致伸缩性，纳米晶Nd_2Fe_（14）B材料的晶粒尺寸应大于20 nm。(C)2004 Elsevier B. V.保留所有权利。
The influence of exchange-coupling interaction on the effective anisotropy in nanocrystalline Nd2Fe14B permanent material has been investigated. The results show that the exchange-coupling interaction between grains causes a decrease of the effective anisotropy constant, K-cff, with decreasing grain size. The variation of K-eff with grain size is basically the same as that of coercivity. The decrease of the effective anisotropy is the main reason for the reduction of the coercivity. In order to get high anisotropy or coercivity in nanocrystalline Nd2Fe14B material, the grain size should be larger than 20 nm. (C) 2004 Elsevier B.V. All rights reserved.