Dynamics of magnetic topological solitons in soft magnetic nanostripes

TL;DR

This paper models the dynamics of magnetic domain walls in soft nanostripes, revealing steady motion, oscillations, and the influence of nanostripe size and field strength on their behavior using a soliton-based approach.

Contribution

It introduces a soliton model to explain domain wall dynamics in nanostripes, predicting critical fields, velocities, and oscillation frequencies, advancing understanding beyond traditional 1D models.

Findings

Reduced wall velocity and critical field in low-field regime

Increased oscillation frequency compared to bulk magnets

Dependence of critical field and velocity on nanostripe size

Abstract

The motions of domain walls driven by magnetic field in soft magnetic nanostripes were calculated. The domain walls reveal steady motions in the low fields and oscillations of their internal structure above a critical field. A developed soliton model of the walls explains its dynamics by the motions of a limited number of magnetic topological solitons such as vortex and antivortex. We predict the reduced wall velocity and critical field in the low-field regime, and increased wall-oscillation frequency in nanostripes, compared to 1D Walker solution for bulk magnets. The critical field and velocity are determined by the nanostripe sizes, whereas the oscillation frequency depends only on the field strength.