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MA: Fachverband Magnetismus
MA 43: Magnetic Semiconductors, Magnetization Dynamics and Damping
MA 43.6: Vortrag
Donnerstag, 21. März 2024, 16:30–16:45, EB 202
Magnetoelastic coupling to transverse and longitudinal phonons revealed by broadband ferromagnetic resonance — •Luise Siegl1, Julie Střihavková2, Richard Schlitz1, Hans Huebl3,4,5, and Sebastian T. B. Goennenwein1 — 1Department of Physics, University of Konstanz — 2Faculty of Mathematics and Physics, Charles University, Prague — 3Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching — 4TUM School of Natural Sciences, Technische Universität München, Garching — 5Munich Center for Quantum Science and Technology (MCQST), München
In ferromagnetic thin films, magnetization dynamics driven, e.g. by ferromagnetic resonance, can coherently couple to phonons. These phonons are subsequently "pumped" into the underlying substrate, such that the process is also referred as phonon pumping. When opposite sides of the sample stack are parallel and polished, the sample forms a bulk acoustic resonator, so that standing sound waves are formed. The magnetoelastic coupling to longitudinal and transverse phonons should exhibit a particular dependence on the orientation of the magnetic field [1]. In this work, we analyze the magnetoelastic coupling depending on the magnetic field orientation in thin yttrium iron garnet films on single crystal gadolinium gallium garnet substrates. From our broadband ferromagnetic resonance measurements, we extract the coupling strength as a function of field orientation and critically compare them to the theoretical predictions.
[1] T. Sato, et al., Phys. Rev. B 104(1), 014403 (2021).
Keywords: acoustic phonon pumping; ferromagnetic resonance; magnon-phonon coupling