论文标题
电压诱导的抗铁磁纳米线中的惯性结构壁运动
Voltage-Induced Inertial Domain Wall Motion in an Antiferromagnetic Nanowire
论文作者
论文摘要
基于磁性域壁（DWS）运动的赛道内存具有较小体积和高读数速度的优势。与电流诱导的DW运动相比，电压诱导的DW运动表现出较低的耗散。另一方面，抗铁磁铁（AFM）中的DW以较弱的弹性场移动。在这项工作中，已经研究了由电压脉冲下的磁各向异性能量梯度引起的AFM DW运动。得出了DW运动的动力学方程。该解决方案表示DW速度高于100 m/s，并且由于惯性，DW能够在脉冲中关闭电压后，以大约100 m/s的速度以约100 m/s的速度移动几秒钟。该DW惯性的机制是根据拉格朗日路线来解释的。另一方面，在DW移动时发出了自旋波，但DW仍然能够以扩大DW宽度的速度越来越高。这表明自旋波发射的能量损失小于各向异性能量梯度的有效场的能量增益。
Racetrack memory based on magnetic domain walls (DWs) motion exhibits advantages of small volume and high reading speed. When compared to current-induced DW motion, voltage-induced DW motion exhibits lower dissipation. On the other hand, the DW in an antiferromagnet (AFM) moves at a high velocity with weak stray field. In this work, the AFM DW motion induced by a gradient of magnetic anisotropy energy under a voltage pulse has been investigated in theory. The dynamics equation for the DW motion was derived. The solution indicates that the DW velocity is higher than 100 m/s, and because of inertia, the DW is able to keep moving at a speed of around 100 m/s for several nano seconds after turning off the voltage in a period of pulse. The mechanism for this DW inertia is explained based on the Lagrangian route. On the other hand, a spin wave is emitted while the DW is moving, yet the DW is still able to move at an ever increasing velocity with enlarging DW width. This indicates energy loss from emission of spin wave is less than the energy gain from the effective field of the gradient of anisotropy energy.
