Self-induced Floquet states via three-wave processes in synthetic antiferromagnets

TL;DR

This paper introduces a mechanism for generating self-induced Floquet states in synthetic antiferromagnets through three-wave interactions, resulting in a frequency comb in magnetization oscillations.

Contribution

It demonstrates how off-resonant radiofrequency driving of optical modes induces limit cycles and Floquet states via predator-prey dynamics in antiferromagnetic systems.

Findings

Limit cycles emerge from predator-prey dynamics of mode populations.

Time-periodic modulation induces Floquet states.

A rich frequency comb appears in the magnetization spectrum.

Abstract

We present a mechanism for self-induced Floquet states involving acoustic and optical modes in synthetic antiferromagnets. By driving optical modes off-resonantly with radiofrequency fields in the canted antiferromagnetic state, limit cycles arising from the predator-prey dynamics of the acoustic and optical mode populations can appear. The cyclic growth and decay of these mode populations induce a time-periodic modulation of the canted state, which subsequently generates Floquet states. These states appear as a rich frequency comb in the power spectrum of magnetization oscillations.