Magnetic Skyrmion Transport in a Nanotrack With Spatially Varying Damping and Non-adiabatic Torque

TL;DR

This paper investigates how spatially varying damping and torque coefficients influence magnetic skyrmion transport in nanotracks, revealing a sinusoidal motion pattern that could enhance skyrmion stability for spintronic devices.

Contribution

It introduces a micromagnetic model demonstrating controlled skyrmion motion via spatially varying parameters, aiding skyrmion transport design.

Findings

Skyrmions move sinusoidally with spatially varying damping and torque.

Spatial variation prevents skyrmion destruction from Hall effect.

Provides design insights for skyrmion-based spintronic channels.

Abstract

Reliable transport of magnetic skyrmions is required for any future skyrmion-based information processing devices. Here we present a micromagnetic study of the in-plane current-driven motion of a skyrmion in a ferromagnetic nanotrack with spatially sinusoidally varying Gilbert damping and/or non-adiabatic spin-transfer torque coefficients. It is found that the skyrmion moves in a sinusoidal pattern as a result of the spatially varying Gilbert damping and/or non-adiabatic spin-transfer torque in the nanotrack, which could prevent the destruction of the skyrmion caused by the skyrmion Hall effect. The results provide a guide for designing and developing the skyrmion transport channel in skyrmion-based spintronic applications.