SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.72: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Nonreciprocal microwave transmission enabled by magnon-phonon conversion — •Florian Kraft1, Yannik Kunz1, Michael Schneider1, Matthias Küss2, Manfred Albrecht2, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Institut für Physik, Universität Augsburg
The magnetoelastic coupling between surface acoustic waves (SAWs) and spin waves (SWs) may enable applications such as miniaturized microwave isolators. The required nonreciprocity can be induced by symmetry breaking coupling mechanisms between phonons and magnons [1]. Here, we investigate nonreciprocal microwave transmission in a device based on the conversion of SAWs, excited by interdigital transducers (IDTs), to SWs, which are detected by a microwave antenna and vice versa. To this end, we use a sample structure made of LiNbO3/Ta(3 nm)/Co40Fe40B20(10 nm). We use a setup for combined microwave and optical spectroscopy based on microfocused Brillouin light scattering spectroscopy and vector network analysis. This allows for simultaneous electrical and optical detection of phonon-magnon-interactions. We analyze the nonreciprocal microwave transmission while simultaneously investigating the phonon-magnon-coupling with spatial resolution.
We acknowledge funding by DFG via project No. 492421737.
[1] M. Küß et al., Phys. Rev. Lett. 125, 217203 (2020).