Ultrafast dynamics of a magnetic antivortex - Micromagnetic simulations

TL;DR

This paper investigates the ultrafast behavior of magnetic antivortices in thin films using micromagnetic simulations, revealing dynamic processes that could enable spin wave-based logic devices.

Contribution

It provides the first detailed simulation-based analysis of antivortex ultrafast dynamics and their potential application in spintronic technologies.

Findings

Antivortex response involves creation of a new antivortex and temporary vortex.

Ultrafast pulses can reverse antivortex core orientation.

Dynamic processes may be used for spin wave generation.

Abstract

The antivortex is a fundamental magnetization structure which is the topological counterpart of the well-known magnetic vortex. We study here the ultrafast dynamic behavior of an isolated antivortex in a patterned Permalloy thin-film element. Using micromagnetic simulations we predict that the antivortex response to an ultrashort external field pulse is characterized by the production of a new antivortex as well as of a temporary vortex, followed by an annihilation process. These processes are complementary to the recently reported response of a vortex and, like for the vortex, lead to the reversal of the orientation of the antivortex core region. In addition to its fundamental interest, this dynamic magnetization process could be used for the generation and propagation of spin waves for novel logical circuits.