Resonant and Off-Resonant Magnetoacoustic Waves in Epitaxial Fe3Si/GaAs Hybrid Structures

Résumé fourni par la source

Surface acoustic waves (SAWs) provide an efficient dynamical coupling between strain and magnetization in micro- and nanometric systems. Using a hybrid device composed of a piezoelectric, GaAs, and a ferromagnetic Heusler alloy thin film, ${\mathrm{Fe}}_{3}\mathrm{Si}$, we are able to quantify the amplitude of magnetoacoustic waves generated with SAWs via magnetic imaging in an x-ray photoelectron microscope. The cubic anisotropy of the sample, together with a low damping coefficient, allows for the observation of resonant and nonresonant magnetoelastic coupling. Additionally, via micromagnetic simulation, we verify the experimental behavior and quantify the magnetoelastic shear strain component in ${\mathrm{Fe}}_{3}\mathrm{Si}$, which appears to be large (${b}_{2}=10\ifmmode\pm\else\textpm\fi{}4\phantom{\rule{0.2em}{0ex}}{\mathrm{MJm}}^{\ensuremath{-}3}$).

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