SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 15: INNOMAG e.V. Prizes 2023 (Diplom-/Master and Ph.D. Thesis)
MA 15.3: Talk
Tuesday, March 28, 2023, 10:10–10:30, HSZ 401
Magnetooptical Investigation of nonreciprocal Phonon- Magnon Interaction — •Yannik Kunz1, Michael Schneider1, Moritz Geilen1, Matthias Küß2, Manfred Albrecht2, Philipp Pirro1, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Institut für Physik, Universität Augsburg
The coupling of surface acoustic waves (SAWs) with spin waves (SWs) intrinsically breaks the time-inversion symmetry. The resulting nonreciprocity can be exploited for applications such as miniaturized microwave isolators. SAWs can be efficiently excited and detected by interdigital transducers. Therefore, in experiments the magnetic field dependent transmission induced by the coupling with SWs is commonly detected via electrical methods [1]. However, for the investigation of magnetoelastic interactions with spatial resolution, magnetooptical measurement methods are needed. We employed microfocused Brillouin light scattering spectroscopy and frequency-resolved magneto-optical Kerr effect spectroscopy [2] to map the spatial dependence of the phonon-magnon-coupling on a LiNbO3/Co40Fe40B20(10 nm)/SiN(5 nm)-structure. Our experiments provide direct evidence for coherent and nonreciprocal conversion of phonons to magnons along the SAW propagation path.
We acknowledge the funding by DFG via project No. 492421737.
[1] M. Küß et al., Phys. Rev. Lett. 125, 217203 (2020).
[2] L. Liensberger et al, IEEE Magnetics Letters 10, 5503905 (2019).