Dependence of coercivity on the intergranular phase for nanocrystalline Nd-Fe-B magnet

Dependence of coercivity on the intergranular phase for nanocrystalline Nd-Fe-B magnet
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纳米晶 Nd-Fe-B 磁体矫顽力对晶间相的依赖性

DOI:
10.1016/j.jallcom.2009.07.089
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发表时间:
2009-11
影响因子:
6.2
通讯作者:
Han, G. B.
Han, G. B.
中科院分区:
材料科学2区
文献类型:
--
作者:
Liu, M.;Gao, R. W.;Yang, W.;Han, G. B.

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假设存在于相邻晶粒之间的晶间相(IP)是弱磁性相,并且可以减弱或中断晶间交换耦合相互作用(IECI)。利用我们提出的晶粒各向异性模型,研究了IP的厚度d和各向异性常数K1(0)对纳米晶Nd-Fe-B磁体磁性能的影响。计算结果表明,随着d的增大,体系的矫顽力增大,而随着K1(0)的增大,体系的矫顽力减小.当d=1.2nm,K1(0)=0.5K1(K1为Nd-Fe-B体材料的共同各向异性常数)时,计算结果与实验数据一致。
Assume that the intergranular phase (IP) existing between adjacent grains is a weak magnetic phase, and could weaken or interrupt the intergrain exchange-coupling interaction (IECI). Using our proposed cubic-grain anisotropy model, we investigate the effects of IP's thickness d, and its anisotropy constant K1(0) on the coercivity of nanocrystalline Nd–Fe–B magnet. Calculation results indicate that the coercivity increases with increasing d, but decreases with increasing K1(0). When d=1.2nm and K1(0)=0.5K1(K1is the common anisotropy constant of the bulk Nd–Fe–B material), our calculated results are consistent with available experimental data.
DOI: 10.1016/0304-8853(88)90202-8
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