Topological spin dynamics in cubic FeGe near room temperature

TL;DR

This study combines experimental and theoretical methods to analyze spin-wave dynamics in cubic FeGe, revealing unique resonance signatures of chiral magnetic phases, which aids in developing spintronic devices.

Contribution

It provides a comprehensive analysis of spin-wave dynamics across all magnetic phases in FeGe using MAS, simulations, and theory, advancing understanding of chiral magnetic textures.

Findings

Distinct resonance frequencies identify different magnetic phases.

Quantitative agreement between theory and experiment confirms phase identification.

MAS effectively maps the magnetic phase diagram.

Abstract

Understanding spin-wave dynamics in chiral magnets is a key step for the development of high-speed, spin-wave based spintronic devices that take advantage of chiral and topological spin textures for their operation. Here we present an experimental and theoretical study of spin-wave dynamics in a cubic B20 FeGe single crystal. Using the combination of waveguide microwave absorption spectroscopy (MAS), micromagnetic simulations, and analytical theory, we identify the resonance dynamics in all magnetic phases (field polarized, conical, helical, and skyrmion phases). Because the resonance frequencies of specific chiral spin textures are unique, quantitative agreement between our theoretical predictions and experimental findings for all resonance frequencies and spin wave modes enables us to unambiguously identify chiral magnetic phases and to demonstrate that MAS is a powerful tool to efficiently extract a magnetic phase diagram. These results provide a new tool to accelerate the integration of chiral magnetic materials into spintronic devices.