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 structuresMarc Rovirola1, Muhammad Waqas Khaliq1,2, Blai Casals1, Michael Foerster2, Miguel Angel Niño2, Lucía Aballe2, Jens Herfort3, Joan Manel Hernàndez1, Ferran Macià1, and •Alberto Hernández-Mínguez31University 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)

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