Magnon-phonon interaction induced electromagnetic wave radiation in the strong coupling region

TL;DR

This paper theoretically investigates how strong magnon-phonon coupling can induce electromagnetic wave radiation, revealing hybridized states with enhanced radiation efficiency and potential for ultra-compact antenna development.

Contribution

It demonstrates the existence of dual resonant frequencies with circular polarization and over 100-fold radiation enhancement in strongly coupled magnon-phonon systems.

Findings

Identification of avoided crossing in radiation spectra

Existence of two hybridized resonant frequencies

Over 100 times increase in antenna radiation efficiency

Abstract

We theoretically study the electromagnetic wave radiation of magnons driven by acoustic phonons in systems with strong magnon-phonon interaction. We evaluate the field dependence of radiation intensity spectra which exhibits the avoided crossing, a characteristic of strongly coupled systems. At the crossover where the magnon and phonon eigenstates are hybridized, we demonstrate the existence of two resonant radiation frequencies with circular polarization and the enhancement of antenna radiation efficiency by over 100 times. Our results open up possibilities of developing ultra-compact antennas by using the hybridized magnon-phonon mode.