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HL: Fachverband Halbleiterphysik
HL 40: Thermal, acoustic and transport properties
HL 40.7: Vortrag
Mittwoch, 18. März 2020, 11:30–11:45, POT 151
Large non-reciprocal transmission of surface acoustic waves in GaAs coated with epitaxial Fe3Si film — •Alberto Hernández-Mínguez1, Ferran Macià2, Joan Manel Hernàndez2, Jens Herfort1, and Paulo Santos1 — 1Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany — 2University of Barcelona, Barcelona, Spain
Non-reciprocal propagation of sound, that is, the different transmission of acoustic waves traveling along opposite directions, is a challenging requirement for the realization of devices like acoustic diodes and circulators. Here, we demonstrate the efficient non-reciprocal transmission of surface acoustic waves (SAWs) with 3.45 GHz frequency propagating along a GaAs substrate coated with a 50-nm-thick epitaxial Fe3Si film. Fe3Si is a binary Heusler-like ferromagnetic metal with potential applications in semiconductor-based spintronic devices. For well-defined orientations of the magnetization in the Fe3Si film, the magneto-elastic (ME) coupling transfers energy from the acoustic into the magnetic system, thus inducing SAW attenuation. The strength of the ME coupling depends on the relative angle between magnetization and SAW wave vector, and leads to attenuation differences of up to 20% for SAWs propagating along opposite directions. We attribute the non-reciprocal behavior to the dependence of the magnetization dynamics on the helicity of the elliptically polarized ME field associated to the SAW. Our simulations confirm these results and show that Fe3Si/GaAs is a promising platform for the realization of efficient on-chip, semiconductor-based non-reciprocal SAW devices.