Effect of interfacial intermixing on spin-orbit torque in Co/Pt bilayers
Effect of interfacial intermixing on spin-orbit torque in Co/Pt bilayers
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DOI：
10.1103/physrevb.105.054405
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发表时间：
2020-03
影响因子：
3.7
通讯作者：
G. B. Flores;K. Belashchenko
中科院分区：
文献类型：
--
作者：
G. B. Flores;K. Belashchenko
采用第一性原理非平衡绿色函数方法和超原胞无序平均方法，研究了Co中界面混合对自旋轨道矩的影响|双层。通过在Co和Pt之间插入一个或多个无序CoPt合金单层来模拟混合。阻尼扭矩适度增强界面混合，而fieldlike扭矩，这是小的突变界面，强烈增强，成为可比的阻尼扭矩。类场转矩的增强归因于Co与混合区之间的界面。平面霍尔扭矩随着混合而增加，但保持相对较小。对于具有（111）和（001）取向界面的双层，扭矩的行为是相似的。类场扭矩对混合的强烈依赖性可以提供一种通过界面工程来调整类场扭矩与类阻尼扭矩之比的方法。
Using the first-principles non-equilibrium Green’s function technique with supercell disorder averaging, we study the influence of interfacial intermixing on the spin-orbit torque in Co | Pt bilayers. Intermixing is modeled by inserting one or more monolayers of a disordered CoPt alloy between Co and Pt. Dampinglike torque is moderately enhanced by interfacial intermixing, while the fieldlike torque, which is small for abrupt interfaces, is strongly enhanced and becomes comparable to the dampinglike torque. The enhancement of the fieldlike torque is attributed to the interface between Co and the intermixed region. The planar Hall-like torque increases with intermixing but remains relatively small. The behavior of the torques is similar for bilayers with (111) and (001)-oriented interfaces. Strong dependence of the fieldlike torque on intermixing could provide a way to tune the fieldlike-to-dampinglike torque ratio by interface engineering.