Edge-Soliton-Mediated Vortex-Core Reversal Dynamics

TL;DR

This paper introduces a novel vortex-core reversal mechanism in magnetic nanodots driven by out-of-plane currents, involving coupled edge-solitons and topological transformations, differing from traditional vortex-antivortex processes.

Contribution

It reveals a new reversal process mediated by coupled edge-solitons and localized gyrotropic fields, expanding understanding of magnetic soliton dynamics in nanostructures.

Findings

Reversal mechanism involves coupled edge-solitons and topological transformations.

Localized gyrotropic fields enable magnetization dip formation.

Distinct from vortex-antivortex pair processes.

Abstract

We report a new reversal mechanism of magnetic vortex cores in nanodot elements driven by out-of-plane currents, occurring through two coupled edge-solitons via dynamic transformations between magnetic solitons of different topological charges. This mechanism differs completely from the well known switching process mediated by the creation and annihilation of vortex-antivortex pairs in terms of the associated topological solitons, energies, and spin-wave emissions. Strongly localized out-of-plane gyrotropic fields induced by the fast motion of the two coupled edge-solitons enable a magnetization dip that plays a crucial role in the formation of the reversed core magnetization. This work provides a new physical insight into the dynamic transformations of magnetic solitons in nanoelements.