Modification of interfacial spin-orbit torque in Co/Pt/oxide hybrid structures
Modification of interfacial spin-orbit torque in Co/Pt/oxide hybrid structures
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DOI：
10.1103/physrevb.104.134401
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发表时间：
2021-10
影响因子：
3.7
通讯作者：
T. Hirai;K. Hasegawa;S. Ota;M. Suzuki;T. Koyama;D. Chiba
中科院分区：
文献类型：
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作者：
T. Hirai;K. Hasegawa;S. Ota;M. Suzuki;T. Koyama;D. Chiba
通过改变氧化层的种类，研究了Co/Pt/氧化物体系中电流诱导的自旋轨道矩（SOT）。当Pt厚度小于2 nm时，由于磁邻近效应，氧化层界面处的Pt发生了磁极化。在这些系统中，类场（FL）的SOT显着依赖于相邻的氧化物材料，而dampinglike SOT几乎是无关的氧化物。Pt/Hf O_{2}$样品的FL SOT效率最大为Pt/MgO样品的2.2倍。X射线磁性圆二色性光谱表明，Pt轨道磁矩的各向异性随氧化物材料的不同而不同，表明Pt/氧化物界面电子结构的调制对SOT的增强有贡献.
We investigate current-induced spin-orbit torque (SOT) in Co/Pt/oxide systems by varying a sort of the oxide layer. When the Pt thickness is less than \ensuremath{\sim}2 nm, Pt at the interface of the oxide layer is magnetically polarized owing to the magnetic proximity effect. In these systems, fieldlike (FL) SOT depends significantly on the adjacent oxide material, whereas dampinglike SOT is almost irrelevant to oxides. The FL SOT efficiency of the $\mathrm{Pt}/\mathrm{Hf}{\mathrm{O}}_{2}$ sample is 2.2 times greater than that of the Pt/MgO sample at the maximum. X-ray magnetic circular dichroism spectroscopy reveals that the anisotropy of the Pt orbital magnetic moment varies with the oxide material, suggesting that the modulation of the electronic structure at the Pt/oxide interface contributes to SOT enhancement.