电流驱动RKKY耦合作用下Skyrmion的动力学特性研究

Dynamic Properties of Current-driven RKKY-coupled Skyrmion

摘要:

研究了不同RKKY铁磁耦合强度对Skyrmion振荡及进动特性的调控。研究结果表明,T层和B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,T层Skyrmion进动位置要超前B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,文章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 study, the dynamic properties of current-driven RKKY-coupled Skyrmion are analyzed. In particular, the manipulation of Skyrmion oscillation and precession by different RKKY ferromagnetic coupling intensities is explored. The results show that the Skyrmion of the Top and Bottom layers can achieve stable oscillation under certain conditions, and the precession of the Skyrmion presents a circular trajectory. Furthermore, the precession position of the Top layer is ahead of that of the Bottom layer, and the coupling strength changes 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 analyzed, and the results show that the driving currents can effectively manipulate the dynamic properties such as the initial oscillation time and stable oscillation radius.