# Spin-wave spectroscopy on Dzyaloshinskii-Moriya interaction in room-temperature chiral magnets hosting skyrmions

## TL;DR

This study uses spin-wave spectroscopy to measure Dzyaloshinskii-Moriya interaction in room-temperature chiral magnets, revealing its critical role in skyrmion formation and demonstrating a potential spin-wave diode function.

## Contribution

It provides a direct quantitative evaluation of DM interaction in bulk chiral magnets hosting skyrmions at room temperature, linking magnetic parameters to skyrmion properties.

## Key findings

- DM interaction magnitude and sign were directly measured.
- Quantitative correlation between DM interaction and skyrmion size and helicity.
- Demonstration of a room-temperature spin-wave diode based on chiral structures.

## Abstract

Propagation character of spin wave was investigated for chiral magnets FeGe and Co-Zn-Mn alloys, which can host magnetic skyrmions near room temperature. On the basis of the frequency shift between counter-propagating spin waves, the magnitude and sign of Dzyaloshinskii-Moriya (DM) interaction were directly evaluated. The obtained magnetic parameters quantitatively account for the size and helicity of skyrmions as well as their materials variation, proving that the DM interaction plays a decisive role in the skyrmion formation in this class of room-temperature chiral magnets. The propagating spin-wave spectroscopy can thus be an efficient tool to study DM interaction in bulk single-phase compounds. Our results also demonstrate a function of spin-wave diode based on chiral crystal structures at room temperature.