Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 13: Magnonics 1

MA 13.2: Talk

Tuesday, September 6, 2022, 09:45–10:00, H43

Propagating Spin-Wave Spectroscopy Studies in a Millikelvin Temperature Environment — •David Schmoll, Sebastian Knauer, Rostyslav Serha, Qi Wang, and Andrii Chumak — University of Vienna, Faculty of Physics, Boltzmanngasse 5, A-1090 Vienna, Austria

Technological advancements in the access to millikelvin temperatures, combined with high-frequency microwave technology, allow first steps towards the investigation of individual magnons, as the corresponding quasi-particles of spin waves, in the field of quantum magnonics. Such experiments require millikelvin base temperatures, to ensure a thermal magnon-free system. We measured spin-wave propagation for external bias magnetic fields in the range of 300 mT to -300 mT at room temperature and at a base temperature of 45 mK. The results were obtained in a cryogenic propagating spin-wave spectroscopy setup, comprising a dilution refrigerator, a 9-1-1 T vector magnet, and a 65 GHz-rated VNA measurement system. The spin-wave transmission was measured in a 70 mm × 2 mm × 5.65 µm yttrium-iron-garnet (YIG) film on a 500 µm-thick gadolinium-gallium-garnet (GGG) substrate in the Magnetostatic Surface Spin-Wave Configuration (MSSW), using a microstrip antenna PCB. The demonstration of spin-wave propagation at cryogenic temperatures, provides the technical capabilities and the platform for future investigations of individual magnons. Moreover, direct optical access to the dilution refrigerator allows millikelvin experiments in the field of hybrid opto-magnonic quantum systems.