Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 23: Magnonics II
MA 23.2: Talk
Wednesday, March 20, 2024, 09:45–10:00, EB 107
Analysis of magnetoacoustic waves in epitaxial Fe3Si/GaAs hybrid structures — Marc Rovirola1, Muhammad Waqas Khaliq1,2, Blai Casals1, Michael Foerster2, Miguel Angel Niño2, Lucía Aballe2, Jens Herfort3, Joan Manel Hernàndez1, Ferran Macià1, and •Alberto Hernández-Mínguez3 — 1University of Barcelona, Barcelona, Spain — 2ALBA Synchrotron Light Source, Cerdanyola del Vallès, Spain — 3Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany
The magnetoelastic interaction provides an efficient dynamical coupling between surface acoustic waves (SAWs) and spin waves (magnons) in micro- and nanometric magnetic systems. In this contribution, we quantify via magnetic imaging in an x-ray photoelectron microscope the amplitude of magnetoacoustic waves (coupled SAW and spin waves) in a hybrid structure consisting of a 74-nm-thick ferromagnetic Fe3Si film grown epitaxially on a piezoelectric substrate, GaAs. The cubic anisotropy of Fe3Si, together with a low damping coefficient, allows for the observation of magnetoacoustic waves with 500 MHz frequency in both resonant and nonresonant conditions, reaching up to 1.5∘ precession amplitude of the magnetization vector around its equilibrium direction. Finally, we compare the experimental behavior with micromagnetic simulations to quantify the magnetoelastic shear strain constant in Fe3Si, obtaining b2 = 10 ± 4 MJ/m3.
[1] M. Rovirola et al., Phys. Rev. Appl. 20, 034052 (2023)
Keywords: surface acoustic waves; spin waves; magnetoelasticity