Anisotropy of grain in nanoscaled magnetic materials
Anisotropy of grain in nanoscaled magnetic materials
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DOI：
10.1063/1.2435813
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发表时间：
2007-03
影响因子：
3.2
通讯作者：
Y. Sun;G. Han;B. Han;Ming Liu;R. Gao
中科院分区：
文献类型：
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作者：
Y. Sun;G. Han;B. Han;Ming Liu;R. Gao
本文研究了纳米磁性材料中晶粒间的交换耦合作用和晶粒的各向异性，提出了适用于不同耦合条件的晶界各向异性表达式K1ij（r）。晶粒界面各向异性K_（1ij）（0）的大小对晶粒的平均各向异性K_（1ij）有很大影响，特别是对软硬相晶粒的平均各向异性K_（1ij）有很大影响。当K1sh（0）较小时，硬晶对软晶各向异性的影响很小，且随D的增大，K1sh（0）单调增大。当K1sh（0）较大时，硬晶粒对软晶粒各向异性的影响较大，在一定晶粒尺寸下，K1sh（0）出现最大值。当K_（1ij）（0）在一定范围内时，计算得到的各向异性随D的变化规律与其他作者给出的各向异性随D的变化规律一致。
The inter-grain exchange-coupling interaction and the anisotropy of grain in nanoscaled magnetic materials have been studied by putting forward an expression of anisotropy at grain boundary, K1ij(r), suitable for different coupling conditions. The value of anisotropy at grain interface K1ij(0) has a great effect on ⟨Kij⟩, especially on the average anisotropy of soft-hard phase grains ⟨K⟩. When K1sh(0) is smaller, the effect of the hard grain on the anisotropy of soft grain is weak, and ⟨K⟩ increases monotonously with increasing D. When K1sh(0) is larger, the effect of the hard grain on the anisotropy of soft grain is strong, and ⟨K⟩ appears maximum at a certain grain size. When the value of K1ij(0) is in a certain range, the calculated variations of anisotropy with D are consistent with that of coercivity given by other authors.