Origin of in-plane uniaxial magnetic anisotropy in CoFeB amorphous ferromagnetic thin films
Origin of in-plane uniaxial magnetic anisotropy in CoFeB amorphous ferromagnetic thin films
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DOI：
10.1103/physrevb.83.212404
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发表时间：
2011-06-28
影响因子：
3.7
通讯作者：
Gallagher, B. L.
中科院分区：
文献类型：
--
作者：
Hindmarch, A. T.;Rushforth, A. W.;Gallagher, B. L.
描述单轴磁各向异性（UMA）的起源在单晶以外的系统中通常是有问题的。我们证明了在GaAs（001）上的非晶CoFeB膜中的面内UMA具有GaAs（001）上的铁磁膜中的界面各向异性的预期对称性，但强度与膜厚度无关，而不是成反比。我们发现，这个体积UMA是一致的键取向的各向异性，通过非晶膜的厚度传播的界面诱导UMA。它是如何解释的，在一般情况下，这种机制可以描述的起源在非晶铁磁薄膜的面内UMA。
Describing the origin of uniaxial magnetic anisotropy (UMA) is generally problematic in systems other than single crystals. We demonstrate an in-plane UMA in amorphous CoFeB films on GaAs(001) which has the expected symmetry of the interface anisotropy in ferromagnetic films on GaAs(001), but strength which is independent of, rather than in inverse proportion to, the film thickness. We show that this volume UMA is consistent with a bond-orientational anisotropy, which propagates the interface-induced UMA through the thickness of the amorphous film. It is explained how, in general, this mechanism may describe the origin of in-plane UMAs in amorphous ferromagnetic films.