论文标题
拓扑抗铁磁序列的时间相关的多态切换，$ _3 $ sn
Time-dependent multistate switching of topological antiferromagnetic order in Mn$_3$Sn
论文作者
论文摘要
通过自旋轨道扭矩操纵抗磁磁性的抗铁磁性为开发抗铁磁体动力学的前所未有的机会。在这项工作中，我们研究了Weyl Antiferromagnet Mn $ _3 $ SN中磁性八极矢量的电流引起的切换，这是脉冲形状，场，温度和时间的函数。我们发现，取决于当前脉冲的时间结构，开关行为可以是可动的，也可以是三角。时间分辨的霍尔效应测量结果表明，MN $ _3 $ sn开关通过两步消灭磁通磁性的过程进行的转换过程是由数十NS的时间尺度自加热而引起的，然后在存在旋转式扭矩的情况下冷却。我们的结果阐明了MN $ _3 $ SN的开关动力学，并证明其开关速度存在外部限制。
The manipulation of antiferromagnetic order by means of spin-orbit torques opens unprecedented opportunities to exploit the dynamics of antiferromagnets in spintronic devices. In this work, we investigate the current-induced switching of the magnetic octupole vector in the Weyl antiferromagnet Mn$_3$Sn as a function of pulse shape, field, temperature, and time. We find that the switching behavior can be either bistable or tristable depending on the temporal structure of the current pulses. Time-resolved Hall effect measurements reveal that Mn$_3$Sn switching proceeds via a two-step demagnetization-remagnetization process caused by self-heating over a timescale of tens of ns followed by cooling in the presence of spin-orbit torques. Our results shed light on the switching dynamics of Mn$_3$Sn and prove the existence of extrinsic limits on its switching speed.
