论文标题
轻质金属/铁磁体双层中的单向轨道磁场
Unidirectional orbital magnetoresistance in light metal/ferromagnet bilayers
论文作者
论文摘要
我们报告了观察到单向磁场抗性（UMR）的观察，该磁力（UMR）源自在自然氧化的Cu/Co BiLayer中电流引起的非平衡轨道动量。由于轨道rashba-edelstein对改变CO的厚度和温度的效应，轨道-UMR的尺度具有扭矩效率，反映了它们的共同起源。我们将UMR归因于铁磁层中轨道依赖的电子散射和轨道转换。与旋转诱导的UMR相反，在薄的CO层中不存在镁对轨道-UMR的贡献，这是我们归因于低能镁和轨道电流之间缺乏耦合。对UMR的镁贡献出现在厚度大于约5 nm的CO层中，这与轨道到旋转的转换长度相当。我们的结果提供了有关基于光金属和轨道传输的Spintronic设备相关的轨道到旋转动量转移过程的见解。
We report the observation of a unidirectional magnetoresistance (UMR) that originates from the nonequilibrium orbital momentum induced by an electric current in a naturally oxidized Cu/Co bilayer. The orbital-UMR scales with the torque efficiency due to the orbital Rashba-Edelstein effect upon changing the Co thickness and temperature, reflecting their common origin. We attribute the UMR to orbital-dependent electron scattering and orbital-to-spin conversion in the ferromagnetic layer. In contrast to the spin-current induced UMR, the magnon contribution to the orbital-UMR is absent in thin Co layers, which we ascribe to the lack of coupling between low energy magnons and orbital current. The magnon contribution to the UMR emerges in Co layers thicker than about 5 nm, which is comparable to the orbital-to-spin conversion length. Our results provide insight into orbital-to-spin momentum transfer processes relevant for the optimization of spintronic devices based on light metals and orbital transport.
