1 School of Information and Electronic Engineering, Hunan City University, Yiyang 413000, Hunan, China 2 All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province,Yiyang 413000, Hunan, China
Abstract: Aprecise control of the skyrmion motion is necessary for the research and development of next-generation spintronic devices. For the current-induced magnetic skyrmion motion, the small skyrmion motion velocity and transverse motion of skrymion are still bottlenecks in the technology application. Current-induced skyrmion motion in the nanostripes with different structures were studied based on the micromagnetism simulation. For the current-induced skyrmion motion in the nanostripe, there are the maximum injection current Jmax and maximum velocity Vmax. In the rectangle nanostripe, the Jmax and Vmax are relatively small. For the groove nanostripes obtained by the taped the center of rectangle nanostripe, the Jmax and Vmax can be significantly increased compared with those of the rectangle nanostripe. However, the ratio of the velocity and injection current density Vx/J, which reflects the driving efficiency, is relatively low. It is firstly proposed that guided nanostripe is formed by tapering the edge of nanostripe to improve Vx/J. In the guided nanostripe, the Vx/J can be significantly increased. The Jmax and Vmax have also been increased to some extent. An optimum channel for skyrmions is a combined nanostripe which has the advantages of guided and groove nanopstripe combined. In the combined nanostripe, the Vx/J is improved, and a larger current density can be injected to obtain a higher motion velocity. The results give guidance for the design and development of spintronic devices based on nanostripes.
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2022, Vol. 36 
