Mechanism of Fast Axially--Symmetric Reversal of Magnetic Vortex Core

TL;DR

This paper presents a collective coordinate model for understanding the rapid reversal of magnetic vortex cores in nanodots under alternating magnetic fields, revealing resonant, nonlinear, and chaotic behaviors confirmed by simulations.

Contribution

It introduces a simple yet comprehensive model capturing vortex core dynamics, including reversal mechanisms and chaotic behavior, validated through micromagnetic simulations.

Findings

Resonant behavior of vortex core dynamics

Prediction of chaotic vortex polarity dynamics

Validation of analytical model with simulations

Abstract

The magnetic vortex core in a nanodot can be switched by an alternating transversal magnetic field. We propose a simple collective coordinate model which describes comprehensive vortex core dynamics, including resonant behavior, weakly nonlinear regimes, and reversal dynamics. A chaotic dynamics of the vortex polarity is predicted. All analytical results were confirmed by micromagnetic simulations.