论文标题
椭圆磁纳米线中曲率梯度引起的域壁阻尼谐波振荡
Domain wall damped harmonic oscillations induced by curvature gradients in elliptical magnetic nanowires
论文作者
论文摘要
了解磁性纳米线（NW）中的域壁（DW）动力学对于要求使用DWS作为信息载体的基于自旋的应用至关重要。这项工作着重于在自旋极化电流和外部磁场的作用下，沿弯曲的西北沿弯曲的西北置换DW的动力学。我们的结果证明，曲率梯度诱导了由交换驱动的有效切向场，负责将DW固定在NW中的最大曲率点附近。 DW平衡位置取决于外部刺激产生的扭矩与曲率引起的有效场之间的竞争。当外部刺激低于一定阈值时，DW遵循在平衡位置周围阻尼的谐波振荡。高于此阈值，DW在振荡的翻译运动下沿着NW移位。
Understanding the domain wall (DW) dynamics in magnetic nanowires (NW) is crucial for spintronic-based applications demanding the use of DWs as information carriers. This work focuses on the dynamics of a DW displacing along a bent NW with an elliptical shape under the action of spin-polarized electric currents and external magnetic fields. Our results evidence that a curvature gradient induces an exchange-driven effective tangential field responsible for pinning a DW near the maximum curvature point in a NW. The DW equilibrium position depends on the competition between the torques produced by the external stimuli and the curvature-induced effective fields. When the external stimuli are below a certain threshold, the DW follows a damped harmonic oscillation around the equilibrium position. Above this threshold, DW displaces along the NW under an oscillatory translational motion.
