Spin Dynamics of a Magnetic Antivortex

TL;DR

This study investigates the spin dynamics of a magnetic antivortex in a permalloy asteroid-shaped nanostructure, revealing gyrotropic modes, spin wave excitations, and the effects of structural modifications on mode degeneracy.

Contribution

It provides the first detailed micromagnetic simulation analysis of antivortex dynamics in asteroid-shaped nanostructures, including mode behavior and size dependence.

Findings

Antivortex exhibits gyrotropic core orbiting similar to vortex states.

Pulsed fields generate azimuthal and radial spin wave modes.

Inserting a hole suppresses core motion and restores mode degeneracy.

Abstract

We report on a study of the dynamics of a magnetic antivortex in a submicron, asteroid shaped, permalloy ferromagnet using micromagnetic simulations. As with vortex states in disk and square geometries, a gyrotropic mode was found in which a shifted antivortex core orbits about the center of the asteroid. Pulsed magnetic fields were used to generate azimuthal or radial spin wave modes, depending on the field orientation. The degeneracy of low frequency azimuthal mode frequencies is lifted by gyrotropic motion of the antivortex core, and restored by inserting a hole in the center of the particle to suppress this motion. We briefly compare the dynamics of the vortex state of the asteroid to the antivortex. The size dependence of the antivortex modes is reported.