Coherent control of Floquet-engineered magnon frequency combs

TL;DR

This paper demonstrates how nanosecond voltage pulses can precisely control magnon frequency combs in magnetic vortices, enabling dynamic switching between auto-oscillation and static states for potential quantum device applications.

Contribution

It introduces a method for deterministic, pulse-based control of Floquet-engineered magnon frequency combs in magnetic vortices, advancing coherent spin dynamics manipulation.

Findings

Controlled magnon frequency combs using voltage pulses

Enabling on-demand switching between auto-oscillation and static states

Establishing vortex systems as platforms for Floquet engineering

Abstract

Frequency combs represent a hallmark of coherence emerging from nonlinear dynamics, where periodic driving organizes energy into a precisely spaced spectral structure. Extending this concept to collective excitations in solids such as magnons, the quanta of spin waves in magnetically ordered materials, offers a powerful route to control energy flow, coherence, and information processing in condensed matter systems. Here, we demonstrate deterministic control of Floquet-engineered magnon frequency combs in magnetic vortices using nanosecond voltage pulses. By tuning the pulse duration and timing, we control the nonlinear energy transfer between magnons and the vortex core, enabling the Floquet-engineered initiation or suppression of magnon frequency combs far below their spontaneous instability threshold. This pulse-programmable interaction allows the vortex to sustain magnon-driven auto-oscillation with high phase stability, or to revert to its static ground state on demand. Our results establish vortex-based magnetic systems as a robust solid-state platform for Floquet engineering, bridging nonlinear spin dynamics with frequency conversion and coherent spin-based quantum devices.