Switching between different vortex states in 2-dimensional easy-plane magnets due to an ac magnetic field

TL;DR

This paper demonstrates that an AC magnetic field can switch vortex polarization states in 2D easy-plane ferromagnets, with simulations confirming the threshold-dependent switching behavior.

Contribution

It introduces a novel method to control vortex states using rotating magnetic fields in 2D easy-plane magnets, supported by computational evidence.

Findings

Vortex polarization can be switched by an AC magnetic field.

Switching occurs only above a certain amplitude threshold.

Backward switching does not occur under the same conditions.

Abstract

Using a discrete model of 2-dimensional easy-plane classical ferromagnets, we propose that a rotating magnetic field in the easy plane can switch a vortex from one polarization to the opposite one if the amplitude exceeds a threshold value, but the backward process does not occur. Such switches are indeed observed in computer simulations.