Element-specific magnetic moments and spin-resolved density of states in CoFeMnZ (Z = Al, Ga; Si, Ge)
Element-specific magnetic moments and spin-resolved density of states in CoFeMnZ (Z = Al, Ga; Si, Ge)
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DOI：
10.1103/physrevb.84.144413
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发表时间：
2011-10-07
影响因子：
3.7
通讯作者：
Elmers, H. J.
中科院分区：
文献类型：
--
作者：
Klaer, P.;Balke, B.;Elmers, H. J.
使用圆二色性在X射线吸收光谱（XAS/XMCD），我们确定元素特定的磁矩和自旋分辨的未占态密度（DOS）的四元赫斯勒化合物CoFeMnZ（Z = Al，Ga; Si，Ge）的Co，Fe和Mn。这些化合物属于一类具有立方LiMgPdSn型结构的高自旋极化材料。不同的结构模型的亚晶格占领导致类似的平均磁化强度值可以区分比较的元素特定的时刻与理论。我们发现这些化合物形成了相似的结构，其中Co，Fe，Mn和Z占据了相关X（2）YZL 2（1）-Heusler结构的X，X '，Y和Z亚晶格，预测了其半金属行为。未占用的部分DOS作为来自XAS/XMCD光谱的Co，Fe和Mn的理论结果进行了比较。一个很好的协议被发现为Co和Fe，而Mn光谱显示额外的最终状态的影响（多重态）。
Using circular dichroism in x-ray-absorption spectroscopy (XAS/XMCD), we determined element-specific magnetic moments and spin-resolved unoccupied densities of states (DOS) for Co, Fe, and Mn in the quaternary Heusler compounds CoFeMnZ (Z = Al, Ga; Si, Ge). These compounds belong to a class of highly spin-polarized materials with cubic LiMgPdSn-type structure. Different structure models for the sublattice occupation leading to similar average magnetization values can be distinguished by comparison of element-specific moments with theory. We find that the compounds form similar structures, where Co, Fe, Mn, and Z occupy the X, X', Y, and Z sublattice of the related X(2)YZ L2(1)-Heusler structure, for which half-metallic behavior was predicted. The unoccupied partial DOS as derived from the XAS/XMCD spectra for Co, Fe, and Mn are compared to theoretical results. A good agreement is found for Co and Fe, while Mn spectra reveal additional final-state effects (multiplets).