Gyromagnetic bifurcation in a levitated ferromagnetic particle

TL;DR

This paper investigates the gyromagnetic bifurcation in a levitated ferromagnetic particle induced by microwave-driven ferromagnetic resonance, revealing stable rotational states and their dependence on spin-rotation coupling.

Contribution

It introduces the concept of gyromagnetic bifurcation in levitated particles and links it to microscopic spin-rotation relaxation processes.

Findings

Two stable rotation solutions appear under certain conditions.

The bifurcation is influenced by the spin-rotation coupling strength.

The system provides a platform to study microscopic relaxation mechanisms.

Abstract

We examine the mechanical rotation of a levitated magnetic particle that is induced by ferromagnetic resonance under microwave irradiation. We show that two stable solutions appear in a certain range of parameters by bifurcation when the rotation frequency is comparable to the microwave frequency. This phenomenon originates from the coexistence of the Barnett and the Einstein-de Haas effects. We also reveal that this measurement is sensitive to the strength of the spin-rotation coupling. Our work provides a platform for accessing a microscopic relaxation process from spin to macroscopic rotation.