SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Focus Session: Spin-Phonon Coupling
MA 34.7: Vortrag
Donnerstag, 30. März 2023, 12:30–12:45, HSZ 02
Parametric excitation and instabilities of spin waves driven by surface acoustic waves — •Moritz Geilen1, Roman Verba2, Alexandra Nicoloiu3, Daniele Narducci4, Adrian Dinescu2, Milan Ender1, Morteza Mohseni1, Florin Ciubotaru4, Mathias Weiler1, Alexandru Müller3, Burkard Hillebrands1, Christoph Adelmann4, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern Landau, Germany — 2Institute of Magnetism, Kyiv, Ukraine — 3National Institute for Research and Development in Microtechnologies, Bucharest, Romania — 4imec, Leuven, Belgium
We present our experimental results on the parametric excitation of spin waves by coherent surface acoustic waves in metallic magnetic thin film structures. The involved magnon modes are analyzed with micro-focused Brillouin light scattering spectroscopy and complementary micromagnetic simulations combined with analytical modelling to determine the origin of the spin-wave instabilities. Depending on the experimental conditions, we observe spin-wave instabilities originating from different phonon-magnon and magnon-magnon scattering processes. Our results demonstrate that an efficient excitation of high amplitude, strongly nonlinear magnons in metallic ferromagnets is possible by surface acoustic waves, which opens novel ways to create micro-scaled nonlinear magnonic systems for logic and data processing.
We acknowledge financial support by EU via
EU Horizon 2020 (contract no.801055) and ERC Starting Grant No. 101042439.