Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Thin Films: Magnetic Coupling Phenomena / Exchange Bias / Magnetic Anisotropy
MA 22.2: Vortrag
Mittwoch, 7. September 2022, 09:45–10:00, H47
Optical detection of magnon-phonon coupling using µFR-MOKE technique — •Manuel Müller1,2, Lukas Liensberger1,2, Mathias Weiler3, Matthias Althammer1,2, Rudolf Gross1,2,4, and Hans Huebl1,2,4 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Technische Universität Kaiserslautern, Kaiserslautern, Germany — 4Munich Center for Quantum Science and Technology (MCQST), München, Germany
Magnetoelastic coupling between wave-like excitations of the spin system (spin waves) and the lattice (elastic waves) can result in a hybridization of both modes. This coupling can reach the strong-coupling regime, which is of interest for future (quantum) applications, such as microwave-to-optics transducers and phononic spin valve devices.
We here present an experimental approach to investigate magnon-phonon coupling for the YIG layers in a YIG/GGG/YIG trilayer on an individual basis using the microfocused frequency-resolved magneto-optic Kerr effect(µFR-MOKE) technique [1]. We discuss the magnetization dynamics recorded individually for the top and bottom YIG layer with those acquired using broadband ferromagnetic resonance. This data gives further insight to the involved modes as well as their coupling. As a longterm perspective, we expect that this technique will allow the investigation of microstructures with enhanced coupling rates via their optimized geometry.
[1] L. Liensberger et al., IEEE Magn. Lett. 10, 5503905 (2019).