电流驱动RKKY耦合作用下skyrmion的动力学特性研究

Research on dynamic properties of current-driven RKKY-coupled skyrmion

摘要:

本文研究了电流驱动RKKY耦合作用下skyrmion的动力学特性,具体研究了不同RKKY铁磁耦合强度对skyrmion振荡及进动特性得调控。研究结果表明,top层和bottom层的skyrmion都可以在一定条件下达到稳定振荡,即skyrmion进动呈现圆形轨迹；同一时刻,top层skyrmion进动位置要超前bottom层,且耦合强度的大小会改变上下两层skyrmion进动半径差值。此外,本文还研究了不同驱动电流对skyrmion动力学特性的影响,研究结果表明驱动电流可以对起始振荡时间、稳定振荡半径等动力学特性进行有效调控。

Abstract:

In this paper, the dynamic characteristics of skyrmion under RKKY coupling driven by current are studied. In particular, the manipulation of skyrmion oscillation and precession by different RKKY ferromagnetic coupling intensities is studied. The results show that the skyrmion of the top layer and the bottom layer can achieve stable oscillation under certain conditions, and the precession of the skyrmion presents a circular trajectory. At the same time, the precession position of the top layer is ahead of that of the bottom layer, and the coupling strength will change the difference of the skyrmion precession radius between the upper and lower layers. In addition, the effects of different driving currents on the dynamic characteristics of skyrmion are also studied, and the results show that the driving currents can effectively manipulate the dynamic characteristics such as the initial oscillation time and stable oscillation radius.