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首页> 外文期刊>Solid State Communications >Effects of intergranular phase on the exchange-coupling interaction and effective anisotropy of nanocrystalline Nd2Fe14B materials
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Effects of intergranular phase on the exchange-coupling interaction and effective anisotropy of nanocrystalline Nd2Fe14B materials

机译：晶间相对纳米晶Nd2Fe14B材料交换耦合相互作用和有效各向异性的影响

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摘要

The effects of intergranular phase with different thickness, d, on the exchange-coupling interaction and effective anisotropy in nanocrystalline lay Nd2Fe14B material have been investigated by adopting a cube model of grain and putting forward two assumed expressions of anisotropy, K-1(lay) (r), in the coupled part of the grain interface. The results showed that both the average anisotropy of the grain, < K >, and the effective anisotropy of the material, K-eff, increase with increasing grain size, D. < K > calculated based on the two expressions increases with increasing d. However, the variations of K-eff with d based on the two expressions are different. Based on the first expression, K-1'(lay) (r), K-eff increases firstly and decreases subsequently with increasing d, and shows maximum value at certain d. Based on the second expression, K-1"(lay) (r), K-eff decreases monotonously with increasing d. The variation tendency of effective anisotropy is basically similar to that of other authors' calculated and experimental coercivity. The existence of intergranular phase with suitable thickness may result in an increase of effective anisotropy and coercivity. (c) 2006 Elsevier Ltd. All rights reserved.
机译：通过采用晶粒的立方模型，并提出了两个假设的各向异性表达式K-1（lay），研究了不同厚度d的晶间相对纳米晶Nd2Fe14B材料中交换耦合作用和有效各向异性的影响。 （r），在晶粒界面的耦合部分。结果表明，晶粒的平均各向异性和材料的有效各向异性K-eff随晶粒尺寸D的增加而增加。基于两个表达式计算出的随d的增加而增加。但是，基于两个表达式的K-eff随d的变化是不同的。根据第一个表达式K-1'（lay）（r），K-eff随d的增加先增大，然后减小，并在特定的d处显示最大值。根据第二个表达式K-1“（lay）（r），K eff随着d的增加而单调减小。有效各向异性的变化趋势基本上与其他作者的计算和实验矫顽力的变化趋势相似。晶界的存在具有适当厚度的金属相可能会导致有效各向异性和矫顽力的增加（c）2006 Elsevier Ltd.保留所有权利。

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