Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Focus Session: Magnetic Phenomena from Phonon Chirality and Angular Momentum II (joint session MA/TT)
MA 10.12: Vortrag
Dienstag, 18. März 2025, 12:30–12:45, H16
Phonon pumping in ferromagnet/nonmagnetic insulator hybrid systems — •Richard Schlitz1, Luise Holder1, Johannes Weber2,3, Mikhail Cherkasskii4, Fabian Engelhardt4, Julie Střihavková5, Matthias Althammer2,3, Silvia V. Kusminskiy4,6, Hans Huebl2,3,7, and Sebastian T. B. Goennenwein1 — 1Department of Physics, University of Konstanz, Konstanz, Germany — 2Walther-Meißner-Institut, BAdW, Garching, Germany — 3School of Natural Sciences, TUM, Garching, Germany — 4Institute for Theoretical Solid State Physics, RWTH Aachen University, Aachen, Germany — 5Faculty of Mathematics and Physics, Charles University, Prague — 6Max Planck Institute for the Science of Light, Erlangen, Germany — 7Munich Center for Quantum Science and Technology, München, Germany
In ferromagnetic thin films, magnetization dynamics, e.g., driven by ferromagnetic resonance, can coherently couple to phonons. If a ferromagnetic film is deposited on a crystalline substrate with polished parallel faces, the sample stack forms a bulk acoustic resonator, leading to characteristic modifications of the magnetic resonance signal.
In this work, we show that the magnetoelastic coupling can mediate the hybridization of the coherent magnetization dynamics with longitudinal and transverse phonons, with a particular dependence on the orientation of the magnetic field. We extract the magnetoelastic coupling parameters and compare them with theoretical expectations. Our results show that both longitudinal and transverse phonons can be efficiently excited, depending on the magnetic field orientation.
Keywords: ferromagnetic resonance; phonon pumping; damping; magnetoelastic coupling