Interfacial spin-orbitronic effects controlled with different oxidation levels at the Co|Al interface

Sachin Krishnia, Libor Vojáček, Tristan Da Câmara Santa Clara Gomes, Nicolas Sebe, Fatima Ibrahim, Jing Li, Luis Moreno Vicente-Arche, Sophie Collin, Thibaud Denneulin, Rafal E. Dunin-Borkowski, Philippe Ohresser, Nicolas Jaouen, André Thiaville, Albert Fert, Henri Jaffrès, Mairbek Chshiev, Nicolas Reyren, Vincent Cros
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Abstract

Perpendicular magnetic anisotropy (PMA) and Dzyaloshinskii-Moriya interactions are key interactions in modern spintronics. These interactions are thought to be dominated by the oxidation of the Co|Al interface in the archetypal Platinum-Cobalt-Aluminum oxide system. Here, we observe a double sign change in the anisotropy and about threefold variation in interfacial chiral interaction, influenced not only by the oxidation, but also by the metallic Al thickness. Contrary to previous assumptions about negligible spin-orbit effects at light metal interfaces, we not only observe strong PMA with fully oxidized Al, decreasing and turning negative (in-plane) with less oxygen at the Co|Al interface, we also observe that the magnetic anisotropy reverts to positive (out-of-plane) values at fully metallic Co|Al interface. These findings suggest modification in Co d band via Co|Al orbital hybridization, an effect supported by X-ray absorption spectroscopy and ab initio theory calculations, highlighting the key impact of strain on interfacial mechanisms at fully metallic Co|Al interface.
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用不同氧化水平控制 Co|Al 界面的界面自旋轨道效应
垂直磁各向异性(PMA)和 Dzyaloshinskii-Moriy 相互作用是现代自旋电子学中的关键相互作用。这些相互作用被认为是由铂-钴-铝氧化物体系中钴-铝界面的氧化作用主导的。在这里,我们观察到了各向异性的双倍变化和界面手性相互作用的三倍变化,这不仅受到氧化作用的影响,还受到金属铝厚度的影响。与以前关于轻金属界面上可忽略不计的夹轨道效应的假设相反,我们不仅观察到完全氧化的铝具有很强的 PMA,随着 Co|Al 界面上氧气的减少而减小并变为负值(平面内),我们还观察到在完全金属化的 Co|Al 界面上磁各向异性恢复为正值(平面外)。这些发现表明,Co d 带通过 Co|Al 轨道杂化发生了改变,X 射线吸收光谱和 abinitio 理论计算都支持这种效应,突出了应变对全金属 Co|Al 界面机制的关键影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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