Controllable transport of a skyrmion in a ferromagnetic narrow channel with voltage-controlled magnetic anisotropy

TL;DR

This paper demonstrates how voltage-controlled magnetic anisotropy can be used to precisely control skyrmion transport in ferromagnetic nanotracks, enabling unidirectional movement and improved stability for spintronic devices.

Contribution

It introduces a numerical study of skyrmion control via VCMA in nanotracks, proposing new methods for unidirectional transport and skyrmion position regulation.

Findings

Skyrmion transport can be unidirectional using VCMA effects.

Periodic VCMA gates can protect skyrmions from edge destruction.

Skyrmion position can be controlled by pulse length adjustments.

Abstract

Magnetic skyrmions have potential applications in next-generation spintronics devices with ultralow energy consumption. In this work, the current-driven skyrmion motion in a narrow ferromagnetic nanotrack with voltage-controlled magnetic anisotropy (VCMA) is studied numerically. By utilizing the VCMA effect, the transport of skyrmion can be unidirectional in the nanotrack, leading to a one-way information channel. The trajectory of the skyrmion can also be modulated by periodically located VCMA gates, which protects the skyrmion from destruction by touching the track edge. In addition, the location of the skyrmion can be controlled by adjusting the driving pulse length in the presence of the VCMA effect. Our results provide guidelines for practical realization of the skyrmion-based information channel, diode, and racetrack memory.