Magnetic skyrmions are promising candidates for next-generation information carriers. Many concepts and prototypes for skyrmion-based devices have been proposed, and most of the studies are based on the motion of isolated skyrmion. Nevertheless, so far, a comprehensive research of multi-skyrmion motion and related device design are still lacking. In this work, a skyrmion subtracter and a skyrmion diverter based on multi-skyrmion motion are numerically demonstrated in a voltage-gated synthetic antiferromagnetic racetrack. It shows that the number of skyrmions along an array n can be subtracted by an integer from 1 to n by proper control of the driving current density and the voltage-controlled magnetic anisotropy in a narrow racetrack, realizing the function of a skyrmion subtracter. Moreover, when the width of racetrack increases, a single array of skyrmions along the racetrack direction can redistribute along the voltage gate due to the blocking effect of the voltage-controlled magnetic anisotropy. As a result, the single array of skyrmions can split into several arrays, realizing the function of a skyrmion diverter. Our results thus provide guidelines for designing novel racetrack-type skyrmionic devices.
Realization of skyrmion subtracter and diverter in a voltage-gated synthetic antiferromagnetic racetrack
Qiang Sheng, X. L. Liu, W. J. Chen, M. Y. Li, L. J. Liu, Yue Zheng; Realization of skyrmion subtracter and diverter in a voltage-gated synthetic antiferromagnetic racetrack. J. Appl. Phys. 14 February 2019; 125 (6): 064502. https://doi.org/10.1063/1.5050368
Download citation file: