Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 45: Magnonics I
MA 45.12: Talk
Thursday, March 19, 2020, 12:30–12:45, HSZ 401
Generation and tuning of a spin wave frequency comb — •Tobias Hula1, Luis Flacke2,3, Lukas Liensberger2,3, M Copus4, Katrin Schultheiss1, Aleksandr Buzdakov1, Mathias Weiler2,3, Robert Camley4, and Helmut Schultheiss1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Walther-Meißner-Institute, Bayerische Akademie der Wissenschaften, Garching, Germany — 3Physik-Department, Technische Universität München, Munich, Germany — 4Center for Magnetism and Magnetic Nanostructures, University of Colorado, Colorado Springs, USA
We present experimental results on the generation of a spin wave frequency comb in a Co25Fe75 wave guide measured by Brillouin light scattering microscopy. By driving the magnetisation at large precession angles, using high RF amplitudes, non-linear four magnon scattering can be observed. When mixing two RF signals with different frequencies and amplitudes, we can actively control the final states that will be populated by this scattering process. Our results show the generation of a frequency comb consisting of several spin waves with tuneable frequency spacing and amplitude. This effect is investigated in different sample geometries, which allow mixing of co-propagating as well as counter-propagating spin waves. Our experimental observations are in qualitative agreement with micromagnetic simulations.
Financial support by the Deutsche Forschungsgemeinschaft within programs SCHU2922/1-1 and WE 5386/4-1 is gratefully acknowledged. K.S. acknowledges funding within the Helmholtz Postdoc Programme.