Electronic structure and magnetic anisotropy of Co/Au(111): A spin-resolved photoelectron spectroscopy study
Electronic structure and magnetic anisotropy of Co/Au(111): A spin-resolved photoelectron spectroscopy study
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Co/Au(111) 的电子结构和磁各向异性：自旋分辨光电子能谱研究
DOI：
10.1103/physrevb.63.195407
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发表时间：
2001
影响因子：
3.7
通讯作者：
A. Kakizaki
中科院分区：
文献类型：
--
作者：
M. Sawada;K. Hayashi;A. Kakizaki
我们测量了在 Au(111) 衬底上外延生长的 Co 薄膜的自旋和角度分辨光发射光谱，并研究了它们的电子和磁性特性。在Co/Au(111)界面，我们观察到$\mathrm{Au}5d$和$\mathrm{Co}3d$态之间的强烈混合，导致$\mathrm{Au}5d$态的自旋极化和平行于表面的$\mathrm{Co}3d$轨道的增加，从而导致垂直磁各向异性 合作电影。 Co薄膜在低覆盖率区域的电子结构与块体hcp Co的电子结构不同，并且随着膜厚度的增加，它变得更接近块体的电子结构。在大约 6 ML 处观察到磁化方向的重新取向，其起源可以通过垂直于表面的 Co 原子距离的弛豫来定性地解释。
We have measured spin- and angle-resolved photoemission spectra of Co thin films epitaxially grown on the Au(111) substrate and investigated their electronic and magnetic properties. At the Co/Au(111) interface, we observed strong mixing between $\mathrm{Au}5d$ and $\mathrm{Co}3d$ states resulting in the spin polarization of $\mathrm{Au}5d$ states and the increase of $\mathrm{Co}3d$ orbitals parallel to the surface, which causes the perpendicular magnetic anisotropy of Co films. The electronic structure of Co thin films in a low-coverage region is different from that of bulk hcp Co and it becomes closer to those of the bulk as film thickness increases. The reorientation of the magnetization direction was observed at about 6 ML, the origin of which is qualitatively explained by the relaxation of the atomic distance of Co perpendicular to the surface.