Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Magnonics II

MA 23.2: Vortrag

Mittwoch, 20. März 2024, 09:45–10:00, EB 107

Analysis of magnetoacoustic waves in epitaxial Fe₃Si/GaAs hybrid structures — Marc Rovirola¹, Muhammad Waqas Khaliq^1,2, 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