Rashba spin-orbit torque derived from the broken inversion symmetry at ferromagnet/heavy metal interfaces has potential application in spintronic devices. In the conventional description of the precessional and damping components of the Rashba spin-orbit torque in magnetization textures, the decomposition coefficients are assumed to be independent of the topology of the underlying structure. Contrary to this common wisdom, for Schrödinger electrons trespassing ballistically across a magnetic domain wall, we found that the decomposition coefficient of the damping component is determined by the topology of the domain wall. The resultant damping Rashba spin-orbit torque is protected by the topology of the underlying magnetic domain wall and robust against small deviations from the ideal domain-wall profile. Our identification of a topological damping Rashba spin-orbit torque component in magnetic domain walls will help one to understand experiments on current-driven domain-wall motion in ferromagnet/heavy metal systems with broken inversion symmetry and to facilitate its utilization in innovative device designs.

中文翻译：

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弹道磁畴壁中的拓扑阻尼Rashba自旋轨道转矩

由铁磁体/重金属界面的反演对称性破坏引起的Rashba自旋轨道转矩在自旋电子器件中具有潜在的应用。在磁化纹理中Rashba自旋轨道扭矩的进动分量和阻尼分量的常规描述中，假定分解系数与基础结构的拓扑结构无关。与这种常识相反，对于薛定ding电子弹道跨过磁畴壁侵入，我们发现阻尼分量的分解系数由畴壁的拓扑结构决定。所产生的阻尼Rashba自旋轨道转矩受到下面的磁畴壁拓扑的保护，并且能够抵抗理想磁畴壁轮廓的微小偏差。