Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnonics I
MA 3.1: Vortrag
Montag, 17. März 2025, 09:30–09:45, H18
Floquet Magnons in a Periodically-Driven Magnetic Vortex — •Christopher Heins1,2, Luaks Körber1,2,3, Joo-Von Kim4, Thibaut Devolder4, Johan Mentink3, Attila Kákay1, Katirn Schultheiss1, Jürgen Fassbender1,2, and Helmut Schultheiss2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Dresden, Germany — 2Technische Universität Dresden, Dresden, Germany — 3Radboud University, Institute of Molecules and Materials, Nijmegen, The Netherlands — 4Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, Palaiseau, France
Magnetic vortices are prominent examples of topology in magnetism with a rich set of dynamic properties. They exhibit an intricate magnon spectrum and show an eigen-resonance of the vortex texture itself, the gyration of the vortex core. The fundamental modes of both excitation types are separated in their resonance frequencies. While the vortex typically gyrates at a few hundred MHz, the magnon modes typically have frequencies in the lower GHz range. Under the influence of a periodic driving field, Floquet states emerge due to a temporal periodicity imposed on the system's ground state by the gyration, much like the formation of Bloch states in the periodic potential of a crystal lattice. While Bloch states are shifted in momentum space, Floquet states are shifted in energy by multiples of the drive frequency.
Keywords: Vortex; Floquet; Spin waves