Magnon-Driven Phononic Frequency Comb in Linear Elastic Media

TL;DR

This paper introduces a novel method to generate phononic frequency combs in linear elastic media by leveraging magnon nonlinearities, enabling GHz-range combs with high stability and broad applications.

Contribution

It demonstrates a new paradigm for phononic frequency combs using magnon-phonon coupling in linear media, overcoming previous nonlinear media limitations.

Findings

Achieved GHz-range PFCs with 0.4 GHz spacing

Verified theoretical predictions with micromagnetic simulations

Overcomes sub-MHz constraints of conventional PFCs

Abstract

Phononic frequency combs (PFCs) typically require nonlinear elastic media, limiting their frequency range and stability. Here, we propose a transformative approach to generate PFCs in purely linear elastic media by harnessing the magnon nonlinearities, offering a new paradigm for frequency comb physics. By tuning the magnon-phonon coupling confined in a magnetic disk of a vortex state into the strong coupling regime, we demonstrate an efficient nonlinearity transfer from magnons to phonons. This mechanism is able to produce GHz-range PFCs with comb spacing set by the vortex core's gyration frequency. Full micromagnetic simulations verify our theoretical predictions, confirming robust comb formation at 3.5 GHz with 0.4 GHz spacing. This approach overcomes the sub-MHz constraints of conventional PFCs, enabling applications in high-precision metrology, nanoscale sensing, and quantum technologies. Our findings also deepen the understanding of the nonlinear dynamics in hybrid magnon-phonon systems and provide a versatile platform for exploring frequency combs in diverse physical systems.