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MA: Fachverband Magnetismus
MA 3: Magnonics I
MA 3.11: Vortrag
Montag, 17. März 2025, 12:15–12:30, H18
Threshold of parametric instability of magnons in different magnetization geometries under quasi-continuous pumping — •Tamara Azevedo1, Rostyslav O. Serha2, Matthias R. Schweizer1, Vitaliy I. Vasyuchka1, Burkard Hillebrands1, and Alexander A. Serga1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Faculty of Physics, University of Vienna, 1090 Vienna, Austria
Parametric electromagnetic pumping of magnons is a key method for exciting and amplifying spin waves. Measuring the threshold of parametric instability, where energy input overcomes magnon damping, is crucial. Using a sensitive, automated technique with a quasi-continuous wave generated by a vector network analyzer, we measured this threshold in tangentially magnetized yttrium iron garnet films. Two geometries were studied: a microstrip pumping resonator aligned parallel and perpendicular to the external magnetization field H0. The threshold power as a function of H0 shows a sawtooth structure, likely caused by wave vector quantization of parametric magnons. In the perpendicular geometry, threshold power peaks suggest magnon-phonon hybridization with longitudinal, transverse, and surface acoustic modes. These results underline the role of magnetization geometry in determining parametric instability thresholds, providing guidance for optimizing spintronic and magnonic devices. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)*TRR 173*268565370 Spin+X (Project B04).
Keywords: Spin Waves; Parametric Pumping