Cavity magnomechanics

TL;DR

This paper introduces cavity magnomechanics, a system where phonons, magnons, and photons are coherently coupled in ferrimagnetic spheres, enabling new phenomena like phonon lasing and triply resonant interactions.

Contribution

It reports the first experimental realization of cavity magnomechanics, demonstrating coherent phonon-magnon interactions and novel features such as parametric amplification and phonon lasing.

Findings

Demonstration of electromagnetically induced transparency and absorption.

Observation of phonon lasing and triply resonant coupling.

Evidence of strong hybridization and tunability of magnon-photon modes.

Abstract

A dielectric body couples with electromagnetic fields through radiation pressure and electrostrictive forces, which mediate phonon-photon coupling in cavity optomechanics. In a magnetic medium, according to Korteweg-Helmholtz formula, magnetostrictive forces should arise and lead to phonon-magnon interaction. Here we report such a coupled phonon-magnon system based on ferrimagnetic spheres, which we term as cavity magnomechanics, by analogy to cavity optomechanics. Coherent phonon-magnon interactions, including electromagnetically induced transparency and absorption, are demonstrated. Excitingly, due to strong hybridization of magnon and microwave photon modes and their high tunability, our platform exhibits new features including parametric amplification of magnons and phonons, triply resonant photon-magnon-phonon coupling and phonon lasing. Our work demonstrates the fundamental principle of cavity magnomechanics and its application as a new information transduction platform based on coherent coupling between photons, phonons and magnons.