Spin-Wave Propagation in the Presence of Interfacial Dzyaloshinskii-Moriya Interaction

TL;DR

This paper investigates how interfacial Dzyaloshinskii-Moriya interactions in ferromagnetic thin films cause non-reciprocal spin-wave propagation and can enhance attenuation length, aiding in material characterization.

Contribution

It provides analytic expressions linking interfacial Dzyaloshinskii-Moriya interactions to spin-wave properties, enabling better understanding and measurement of these effects.

Findings

Interfacial Dzyaloshinskii-Moriya interaction causes non-reciprocal spin-wave propagation.

The interaction can increase spin-wave attenuation length under certain conditions.

Comparison with experiments helps characterize interfacial Dzyaloshinskii-Moriya interactions.

Abstract

In ferromagnetic thin films, broken inversion symmetry and spin-orbit coupling give rise to interfacial Dzyaloshinskii-Moriya interactions. Analytic expressions for spin-wave properties show that the interfacial Dzyaloshinskii-Moriya interaction leads to non-reciprocal spin-wave propagation, i.e. different properties for spin waves propagating in opposite directions. In favorable situations, it can increase the spin-wave attenuation length. Comparing measured spin wave properties in ferromagnet$|$normal metal bilayers and other artificial layered structures with these calculations can provide a useful characterization of the interfacial Dzyaloshinskii-Moriya interactions.