Skyrmion-based high-frequency signal generator
Skyrmion-based high-frequency signal generator
复制标题
基于斯格明子的高频信号发生器
DOI：
10.1063/1.4978510
复制
发表时间：
2017-03-13
影响因子：
4
通讯作者：
You, Long
中科院分区：
文献类型：
--
作者：
Luo, Shijiang;Zhang, Yue;You, Long
基于skyrmion的器件的许多概念已经被提出，并且它们的大多数可能的应用是基于在具有收缩几何形状的区域中由直流电流驱动的skyrmion的运动。然而，由脉冲电流驱动的Skyrmion运动至今尚未被研究。在这项工作中，我们提出了一个基于Skyrmion的高频信号发生器的基础上，脉冲电流驱动的圆形运动的Skyrmion在一个正方形的薄膜微磁模拟。结果表明，Skyrmions可以沿中心对称的封闭曲线运动。可以通过调整膜的尺寸、电流密度、Dzyaloshinskiii-Moriya相互作用常数和局部面内磁各向异性来调整轨迹和循环周期。周期可以从几纳秒到几十纳秒进行调谐，这为基于Skyrmions的高频信号发生器的制备提供了可能。
Many concepts for skyrmion-based devices have been proposed, and most of their possible applications are based on the motion of skyrmions driven by a dc current in an area with a constricted geometry. However, skyrmion motion driven by a pulsed current has not been investigated so far. In this work, we propose a skyrmion-based high-frequency signal generator based on the pulsed-current-driven circular motion of skyrmions in a square-shaped film by micromagnetic simulation. The results indicate that skyrmions can move in a closed curve with central symmetry. The trajectory and cycle period can be adjusted by tuning the size of the film, the current density, the Dzyaloshinskii–Moriya interaction constant, and the local in-plane magnetic anisotropy. The period can be tuned from several nanoseconds to tens of nanoseconds, which offers the possibility to prepare high-frequency signal generator based on skyrmions.