Evidence of half-metallic interface magnetism via local moment formation in Co based Heusler alloys
Evidence of half-metallic interface magnetism via local moment formation in Co based Heusler alloys
复制标题
通过钴基霍斯勒合金中局部矩形成的半金属界面磁性的证据
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
T. Miyazaki
中科院分区：
文献类型：
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作者：
N. Telling;P. Keatley;G. Laan;R. Hicken;E. Arenholz;Y.;Sakuraba;M. Oogane;Y. Ando;T. Miyazaki
在这项工作中，我们使用X射线磁圆和线性二色性（XMCD和XMLD）技术的组合来检查Co 2 MnX成分的Heusler合金（其中X=Si或Al）中的局部矩的形成。半金属体系中局部矩的存在依赖于少数自旋态的带隙。通过利用x射线技术的元素特异性，我们能够通过Co和Mn原子上矩的局部化程度来探索部分态密度（PDOS）中少数自旋带隙的起源。当比较Co 2 MnSi （CMS）和Co 2 MnAl （CMA）薄膜时，我们观察到Co力矩定位的关键差异，这与预测的Co PDOS中较大的少数自旋间隙一致。这些结果为Co少数自旋态在这些Heusler合金中实现半金属铁磁性（HMF）的主导作用提供了重要证据。他们还演示了一种直接测量原材料中界面HMF程度的方法，而无需制造自旋输运装置。
In this work we use a combination of x-ray magnetic circular and linear dichroism (XMCD and XMLD) techniques to examine the formation of local moments in Heusler alloys of the composition Co 2 MnX (where X=Si or Al). The existence of local moments in a half-metallic system is reliant upon the band gap in the minority-spin states. By utilising the element-specific nature of x-ray techniques we are able to explore the origin of the minority-spin band gap in the partial density of states (PDOS), via the degree of localisation of moments on Co and Mn atoms. We observe a crucial difference in the localisation of the Co moment when comparing Co 2 MnSi (CMS) and Co 2 MnAl (CMA) films that is consistent with the predicted larger minority-spin gap in the Co PDOS for CMS. These results provide important evidence for the dominant role of the Co minority-spin states in realising half-metallic ferromagnetism (HMF) in these Heusler alloys. They also demonstrate a direct method for measuring the degree of interfacial HMF in the raw materials without the need for fabricating spin-transport devices.