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MA: Fachverband Magnetismus

MA 16: Magnonics I

MA 16.1: Talk

Tuesday, March 19, 2024, 09:30–09:45, EB 107

Propagating spin-wave spectroscopy in a liquid-phase epitaxial nanometer-thick YIG film at millikelvin temperatures — •Sebastian Knauer1, Kristýna Davídková2, David Schmoll1,3, Rostyslav O. Serha1,3, Andrey Voronov1,3, Qi Wang1, Roman Verba4, Oleksandr V. Dobrovolskiy1, Morris Lindner5, Timmy Reimann5, Carsten Dubs5, Michal Urbánek2, and Andrii V. Chumak11Faculty of Physics, University of Vienna, A-1090 Vienna, Austria — 2CEITEC BUT, Brno University of Technology, 612 00 Brno, Czech Republic — 3Vienna Doctoral School in Physics, University of Vienna, A-1090 Vienna, Austria — 4Institute of Magnetism, Kyiv 03142, Ukraine — 5INNOVENT e.V. Technologieentwicklung, Prüssingstraße 27B, 07745 Jena, Germany

Realising large-scale integrated magnonic circuits for quantum applications requires propagating spin-wave spectroscopy in nanostructures at low temperatures. In this work, we demonstrate all-electrical spin-wave propagation in a 100 nm-thick yttrium-iron-garnet (YIG) film at temperatures down to 45mK. The extracted spin-wave group velocity and the YIG saturation magnetisation agree well with the theoretical values. We show that the gadolinium-gallium-garnet (GGG) substrate influences the spin-wave propagation characteristics only for the applied magnetic fields beyond 75mT, originating from a GGG magnetisation up to 62kA/m (45mK). Our results demonstrate that the developed fabrication and measurement methodologies enable the realisation of integrated magnonic quantum nanotechnologies at millikelvin temperatures.

Keywords: Millikelvin Temperature Magnonics; All-Electrical Spin-wave Propagation; Nanomagnonics; Quantum Magnonics

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