Terahertz magnon frequency comb

TL;DR

This paper demonstrates the generation of terahertz magnon frequency combs through nonlinear interactions between spin waves and skyrmions in antiferromagnets, extending magnonic frequency combs into the THz regime for ultrafast applications.

Contribution

It introduces a method to produce THz magnon frequency combs via three-wave mixing in antiferromagnetic materials, expanding the frequency range of magnonic combs.

Findings

THz MFC can be generated by nonlinear spin wave-skyrmion interactions.

The three-wave mixing strength depends linearly on the driving frequency.

The MFC signal is observable over a broad frequency range.

Abstract

Magnon frequency comb (MFC), the spin-wave spectra composing of equidistant coherent peaks, is attracting much attention in magnonics. A terahertz (THz) MFC, combining the advantages of the THz and MFC technologies, is highly desired because it would significantly advance the MFC applications in ultrafast magnonic metrology, sensing, and communications. Here, we show that the THz MFC can be generated by nonlinear interactions between spin waves and skyrmions in antiferromagnets [Z. Jin \emph{et al}., \href{https://doi.org/10.48550/arXiv.2301.03211}{arXiv:2301.03211}]. It is found that the strength of the three-wave mixing between propagating magnons and breathing skyrmions follows a linear dependence on the driving frequency and the MFC signal can be observed over a broad driving frequency range. Our results extend the working frequency of MFC to the THz regime, which would have potential applications in ultrafast spintronic devices and promote the development of nonlinear magnonics in antiferromagnets.