Large anisotropic Fe orbital moments in perpendicularly magnetized Co2FeAl Heusler alloy thin films revealed by angular-dependent x-ray magnetic circular dichroism
Large anisotropic Fe orbital moments in perpendicularly magnetized Co2FeAl Heusler alloy thin films revealed by angular-dependent x-ray magnetic circular dichroism
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DOI：
10.1063/1.4819915
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发表时间：
2013-09-02
影响因子：
4
通讯作者：
Mitani, Seiji
中科院分区：
文献类型：
--
作者：
Okabayashi, Jun;Sukegawa, Hiroaki;Mitani, Seiji
利用随角变化的X射线磁圆二色性研究了与MgO层共有界面的Heusler合金Co2FeAl薄膜的垂直磁各向异性（PMA）。轨道和自旋磁矩推导分别为Fe和Co的3d电子。此外，PMA的能量估计使用的轨道磁矩平行和垂直于膜表面。我们发现，PMA在Co_2FeAl中主要是由具有大的轨道磁矩的Fe原子的贡献，这是增强在Co_2FeAl和MgO之间的界面。此外，Fe和Co的元素比磁化曲线被发现是相似的，这表明存在铁磁耦合之间的Fe和Co PMA方向。(C)2013 AIP Publishing LLC.
Perpendicular magnetic anisotropy (PMA) in Heusler alloy Co2FeAl thin films sharing an interface with a MgO layer is investigated by angular-dependent x-ray magnetic circular dichroism. Orbital and spin magnetic moments are deduced separately for Fe and Co 3d electrons. In addition, the PMA energies are estimated using the orbital magnetic moments parallel and perpendicular to the film surfaces. We found that PMA in Co2FeAl is determined mainly by the contribution of Fe atoms with large orbital magnetic moments, which are enhanced at the interface between Co2FeAl and MgO. Furthermore, element specific magnetization curves of Fe and Co are found to be similar, suggesting the existence of ferromagnetic coupling between Fe and Co PMA directions. (C) 2013 AIP Publishing LLC.