# Asymmetric Spin-wave Dispersion on Fe(110): Direct Evidence of Dzyaloshinskii--Moriya Interaction

## TL;DR

This study provides direct experimental evidence of the Dzyaloshinskii-Moriya interaction affecting spin-wave dispersion in Fe(110), revealing asymmetry and degeneracy breaking in spin waves.

## Contribution

It is the first measurement of Dzyaloshinskii-Moriya interaction effects on spin-wave dispersion in Fe(110) using experimental techniques.

## Key findings

- Dzyaloshinskii-Moriya interaction causes asymmetric spin-wave dispersion.
- Degeneracy of spin waves is broken by the interaction.
- Extended Heisenberg model quantifies Dzyaloshinskii-Moriya vectors.

## Abstract

The influence of the Dzyaloshinskii-Moriya interaction on the spin-wave dispersion in an Fe double layer grown on W(110) is measured for the first time. It is demonstrated that the Dzyaloshinskii-Moriya interaction breaks the degeneracy of spin waves and leads to an asymmetric spin-wave dispersion relation. An extended Heisenberg spin Hamiltonian is employed to obtain the longitudinal component of the Dzyaloshinskii-Moriya vectors from the experimentally measured energy asymmetry.