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MA: Fachverband Magnetismus

MA 16: Magnonics

MA 16.1: Talk

Tuesday, March 28, 2023, 09:30–09:45, HSZ 403

Resonances in periodically driven magnon systems — •Jan Mathis Giesen, Christoph Dauer, Imke Schneider, Sebastian Eggert, Alexandre Abbass Hamadeh, and Philipp Pirro — Department of Physics and Research Center Optimas, Technical University of Kaiserslautern, 67663 Kaiserslautern, Germany

Parametric resonances in ferro- and ferri-magnetic systems under a periodic drive are known for quite some while. So called parallel pumping, which is for example used to realize Magnon BECs in materials like YIG, is normally achieved by driving the system with twice the frequency of a certain magnon mode. Much less research has been dedicated to lower lying resonances, which in theory should also be possible and give rise to some interesting behaviours.

We establish a method based on Floquet theory to efficiently determine and examine instabilities of the microscopic magnon system. As a central consequence parametric resonances occur if the driving frequency is an integer multiple of two times the energy of the elementary excitation. In particular we examine regions of resonances for frequencies below the energy spectrum and predict different effects depending on the driving amplitude and frequency, like the vanishing of instabilities at high driving fields. We compare our results with phenomenological approaches to investigate the role damping plays in such systems and perform micromagnetic simulations in order to confirm our results.