Coinage-metal capping效应对Co/Ru（0001）自旋重取向的影响
Coinage-metal capping effects on the spin-reorientations of Co/Ru(0001)
摘要：
已知Co/Ru（0001）的薄膜表现出不寻常的自旋重取向转变（SRT），该转变与Co厚度在4层以下的Co原子层的完成相耦合。利用自旋极化低能电子显微术，我们在实空间中跟踪了Co/Ru（0001）上原子级厚覆盖层生长过程中的磁化取向。用铸币金属（Cu、Ag、Au）元素覆盖修改SRT，这取决于Co和覆盖层厚度以及覆盖层材料，从而导致具有高垂直磁各向异性的结构的范围扩大。SRT的起源可以解释在从头计算的层分辨的贡献的磁各向异性能量。除了在SRT引入的封盖的变化，磁各向异性的定量增强被确定。应变和纯电子效应之间的相互作用的详细分析，使我们能够确定的条件下，导致高的垂直磁各向异性在薄的六方晶系钴膜。
英文摘要：
Thin films of Co/Ru(0001) are known to exhibit an unusual spin reorientation transition (SRT) coupled to the completion of Co atomic layers for Co thicknesses under 4 layers. By means of spin-polarized low-energy electron microscopy, we follow in real space the magnetization orientation during the growth of atomically thick capping layers on Co/Ru(0001). Capping with coinage-metal (Cu, Ag, Au) elements modifies the SRT depending on the Co and overlayer thickness and on the overlayer material, resulting in an expanded range of structures with high perpendicular magnetic anisotropy. The origin of the SRT can be explained in terms of ab-initio calculations of the layer-resolved contributions to the magnetic anisotropy energy. Besides the changes in the SRT introduced by the capping, a quantitative enhancement of the magnetic anisotropy is identified. A detailed analysis of the interplay between strain and purely electronic effects allows us to identify the conditions that lead to a high perpendicular magnetic anisotropy in thin hcp Co films.
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