论文标题
手性对称性断裂，以确定旋转轨道扭矩的垂直磁化的确定性切换
Chiral symmetry breaking for deterministic switching of perpendicular magnetization by spin-orbit torque
论文作者
论文摘要
对称破坏是确定分叉系统的哪个分支在越过临界点后遵循的特征。具体而言，在自旋轨道扭矩（SOT）设备中，出现了一个基本问题：如何通过平面自旋极化破坏垂直磁矩的对称性？在这里，我们表明DMI的手性对称性破坏可以诱导垂直磁化的确定性SOT切换。通过引入饱和磁化或磁各向异性的梯度，非共线自旋纹理是由有效SOT强度的梯度形成的，因此DMI破坏了SOT诱导的自旋纹理的手性对称性，从而导致确定性的磁化磁化。我们引入了一种诱导平面外（Z）磁性梯度的策略，作为用于SOT设备的晶状体制造的实用解决方案。
Symmetry breaking is a characteristic to determine which branch of a bifurcation system follows upon crossing a critical point. Specifically, in spin-orbit torque (SOT) devices, a fundamental question arises: how to break the symmetry of the perpendicular magnetic moment by the in-plane spin polarization? Here, we show that the chiral symmetry breaking by the DMI can induce the deterministic SOT switching of the perpendicular magnetization. By introducing a gradient of saturation magnetization or magnetic anisotropy, non-collinear spin textures are formed by the gradient of effective SOT strength, and thus the chiral symmetry of the SOT-induced spin textures is broken by the DMI, resulting in the deterministic magnetization switching. We introduce a strategy to induce an out-of-plane (z) gradient of magnetic properties, as a practical solution for the wafer-scale manufacture of SOT devices.
