Dissipation characteristics of quantized spin waves in nano-scaled magnetic ring structures

TL;DR

This study investigates how spin-wave modes dissipate in nano-sized magnetic rings, revealing that higher frequency modes decay faster and suggesting three-magnon processes contribute to energy loss.

Contribution

It provides new insights into the dissipation mechanisms of quantized spin waves in nano-scaled magnetic ring structures, highlighting the role of three-magnon processes.

Findings

Decay constant decreases with increasing mode frequency

Higher-order modes show increased dissipation

Three-magnon processes likely contribute to mode damping

Abstract

The spatial profiles and the dissipation characteristics of spin-wave quasi-eigenmodes are investigated in small magnetic Ni$_{81}$Fe$_{19}$ ring structures using Brillouin light scattering microscopy. It is found, that the decay constant of a mode decreases with increasing mode frequency. Indications for a contribution of three-magnon processes to the dissipation of higher-order spin-wave quasi-eigenmodes are found.