Heavy metal elements with strong spin–orbit coupling generally play an important role for perpendicular magnetic anisotropy (PMA) in magnetic heterostructures. We examined interface PMA and related properties in single crystal Fe/MgO(0 0 1) heterostructures in which a very thin W interface layer was nominally inserted as doping. The PMA energy density was reduced with increasing the W layer thickness, in contrast to the results in a similar study using poly-crystal FeB/MgO heterostructures (Nozaki et al 2018 APL Mater . 6 026101), suggesting that the detailed mechanisms of PMA are different between single crystal Fe/MgO and poly-crystal FeB/MgO. X-ray magnetic circular dichroism measurements revealed that anisotropy in the Fe orbital magnetic moments decreased with the PMA energy density, i.e. the PMA observed was interpreted in the framework of Bruno’s model (Bruno 1989 Phys. Rev . B 39 R865). The coefficient of the voltage effect of PMA arising...

中文翻译：

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钨掺杂对单晶Fe / MgO（0 0 1）界面中垂直磁各向异性的影响及其电压效应

具有强自旋-轨道耦合的重金属元素通常对异质结构中的垂直磁各向异性（PMA）起重要作用。我们检查了单晶Fe / MgO（0 0 1）异质结构中的界面PMA和相关性能，其中非常薄的W界面层名义上作为掺杂物插入。与使用多晶FeB / MgO异质结构的类似研究结果相反（Nozaki等人2018 APL Mater.6 026101），PMA能量密度随W层厚度的增加而降低（这表明PMA的详细机理是单晶Fe / MgO和多晶FeB / MgO的区别。X射线磁性圆二色性测量结果表明，Fe轨道磁矩的各向异性随PMA能量密度而减小，即 在布鲁诺模型（Bruno 1989 Phys。Rev. B 39 R865）的框架内解释了观察到的PMA。产生PMA的电压效应的系数...