Antiferromagnetic skyrmion as a magnonic lens

TL;DR

This paper proposes and verifies through simulations that antiferromagnetic skyrmions can act as lenses for spin waves, enabling wave manipulation for future energy-efficient information technologies.

Contribution

It introduces the concept of using antiferromagnetic skyrmions as spin wave lenses and explains the deflection mechanism caused by Dzyaloshinskii-Moriya interaction.

Findings

Antiferromagnetic skyrmions can function as spin wave lenses.

Dzyaloshinskii-Moriya interaction causes spin wave deflection.

The lensing effect occurs above a certain Dzyaloshinskii-Moriya strength.

Abstract

A lens, a device transforming propagation directions in an organized fashion, is one of the fundamental tools for wave manipulation. Spin wave, the collective excitation of ordered magnetizations, stands out as a promising candidate for future energy-saving information technologies. Here we propose theoretically and verify by micromagnetic simulations, that an antiferromagnetic skyrmion naturally serves as a lens for spin wave, when the Dzyaloshinskii-Moriya strength exceeds a threshold. The underlying mechanism is the spin wave deflection caused by Dzyaloshinskii-Moriya interaction, a mechanism that is ordinarily overshadowed by the magnetic topology.