Chi Xiaodan, Du An, Hu Yong
Department of Physics, College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China.
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, People's Republic of China.
Nanotechnology. 2021 Apr 14;32(27). doi: 10.1088/1361-6528/abf302.
We report a Monte-Carlo simulation of the formation of skyrmions under a rotary magnetic field on a nanotube. The zero-field magnetic state is characterized as helical stripe domains swirling on the nanotube, with one to three periods depending on the ratio of Dzyaloshinskii-Moriya to ferromagnetic interaction and tubular size. Under a rotary magnetic field, the formation of skyrmions is in pair and the skyrmion number can be tuned. The movement of skyrmions is neither synchronous along with the rotary field, nor along a helical trajectory perpendicular to the rotary field. It is ascribed to that within a skyrmion pair, on one hand, the coupling between skyrmions is nonnegligible; on the other hand, different skyrmion pairs side by side are decoupled. This work predicts a way of nanotube-based skyrmion manipulation, and might develop the rotary information storage on energy- and space-saving modes or an edgeless racetrack memory.
我们报道了在纳米管上的旋转磁场下斯格明子形成的蒙特卡罗模拟。零场磁态的特征是纳米管上呈螺旋条纹畴涡旋，其周期数为一到三个，这取决于Dzyaloshinskii-Moriya相互作用与铁磁相互作用的比率以及管径大小。在旋转磁场下，斯格明子成对形成且其数量可以调节。斯格明子的运动既不与旋转场同步，也不沿着垂直于旋转场的螺旋轨迹运动。这归因于在一个斯格明子对中，一方面，斯格明子之间的耦合不可忽略；另一方面，并排的不同斯格明子对是解耦的。这项工作预测了一种基于纳米管的斯格明子操控方式，并可能开发出节能和节省空间模式下的旋转信息存储或无边缘赛道存储器。
