Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 20: Poster I
MA 20.9: Poster
Tuesday, March 19, 2024, 16:30–19:00, Poster A
Magneto-Optical Investigation of Magnetoacoustic Waves in Yttrium Iron Garnet / Zinc Oxide Heterostructures — •Kevin Künstle1, Finlay Ryburn2, Yannik Kunz1, Vitaliy Vasyuchka1, Yangzhan Zhang2, Timmy Reimann3, Morris Lindner3, Carsten Dubs3, John F. Gregg2, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OP- TIMAS, RPTU Kaiserslautern-Landau, Kaiserslautern, Germany — 2Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, United Kingdom — 3INNOVENT E.V. Technologieentwick- lung, Jena, Germany
In recent years, the coupling of surface acoustic waves (SAWs) with spin waves (SWs) in ferromagnetic metals has emerged as a viable option for realising applications such as acoustic diodes, due to the inherently non-reciprocal SAW-SW interaction. However, the coupling of SAWs with SWs in ferrimagnetic insulators has been much less explored. We study SAWs excited by interdigital transducers made of Ti/Au deposited on a GGG/YIG thin film bilayer and covered with a piezo- electric ZnO layer. The ferrimagnetic YIG thin film acts as a source of SWs to which the SAWs can couple. We used micro-focused Bril- louin light scattering (BLS) spectroscopy and vector network analyser measurements to identify the SAW characteristics. We extracted the SAW group velocity and reconstructed the non-linear SAW dispersion in the heterostructure. Furthermore, we studied the magnetic field dependent interaction of the SAWs with SWs.
Keywords: Magneto-elastic coupling; YIG; ZnO; Surface acoustic wave; Magnon