Self-induced Floquet magnons in magnetic vortices

Christopher Heins; Lukas Körber; Joo-Von Kim; Thibaut Devolder; Johan H. Mentink; Attila Kákay; Jürgen Fassbender; Katrin Schultheiss; Helmut Schultheiss

arXiv · 2409.02583

Self-induced Floquet magnons in magnetic vortices

Christopher Heins·Lukas Körber·Joo-Von Kim·Thibaut Devolder·Johan H. Mentink·Attila Kákay·Jürgen Fassbender·Katrin Schultheiss·Helmut Schultheiss

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Abstract

Driving condensed matter systems with periodic electromagnetic fields can result in exotic states not found in equilibrium. Termed Floquet engineering, such periodic driving applied to electronic systems can tailor quantum effects to induce topological band structures and control spin interactions. However, Floquet engineering of magnon band structures in magnetic systems has proven challenging so far. Here, we present a class of Floquet states in a magnetic vortex that arise from nonlinear interactions between the vortex core and microwave magnons. Floquet bands emerge through the periodic oscillation of the core, which can be initiated by either driving the core directly or pumping azimuthal magnon modes. For the latter, the azimuthal modes induce core gyration through nonlinear interactions, which in turn renormalizes the magnon band structure. This represents a self-induced mechanism for Floquet band engineering and offers new avenues to study and control nonlinear magnon dynamics.

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Christopher Heins, Lukas Körber, Joo-Von Kim, Thibaut Devolder, Johan H. Mentink, Attila Kákay, Jürgen Fassbender, Katrin Schultheiss, Helmut Schultheiss. 2024-09-04. Self-induced Floquet magnons in magnetic vortices. https://arxiv.org/abs/2409.02583

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