论文标题
铁磁三层垂直磁化的旋转轨道扭矩切换
Spin-orbit torque switching of perpendicular magnetization in ferromagnetic trilayers
论文作者
论文摘要
在铁磁三层中，自旋轨道诱导的自旋电流可以具有旋转极化，该旋转极化与旋转厅效应的方向偏离了方向。最近，通过实验提出并确认了铁磁三层中的磁化切换。在这项工作中，我们从理论上和数字上研究了铁磁三层中垂直磁化开关所需的开关电流。我们确认，倾斜的自旋极化可以比传统的旋转轨道扭矩或自旋转移扭矩开关在较低的电流下实现无场确定性开关，从而为高密度和低功率自旋轨道扭矩设备提供了可能性。此外，我们为任意旋转极化方向提供开关电流的分析表达式，这对于设计自旋轨道扭矩设备和解释旋转轨道扭矩开关实验非常有用。
In ferromagnetic trilayers, a spin-orbit-induced spin current can have a spin polarization of which direction is deviated from that for the spin Hall effect. Recently, magnetization switching in ferromagnetic trilayers has been proposed and confirmed by the experiments. In this work, we theoretically and numerically investigate the switching current required for perpendicular magnetization switching in ferromagnetic trilayers. We confirm that the tilted spin polarization enables field-free deterministic switching at a lower current than conventional spin-orbit torque or spin-transfer torque switching, offering a possibility for high-density and low-power spin-orbit torque devices. Moreover, we provide analytical expressions of the switching current for an arbitrary spin polarization direction, which will be useful to design spin-orbit torque devices and to interpret spin-orbit torque switching experiments.
