Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.41: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Investigation of Quasipaticle Spin Transport in Superconductors/Ferrimagnet Heterostructures — •Yuhao Sun1,2, Manuel Müller1,2, Janine Gückelhorn1,2, Matthias Grammer1,2, Hans Huebl1,2,3, Rudolf Gross1,2,3, and Matthias Althammer1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Munich Center for Quantum Science and Technology, München, Germany
Magnon based spintronics is intensely researched as it enables alternative information processing schemes and additional functionalities compared to charge based counterparts. Recent studies suggest that the interplay of superconductivity and magnetism can enhance spin-related effects, such as the interfacial spin injection efficiency [1]. The present assumption is that magnetic excitation or magnons interact with the quasiparticles of the superconducting phase. To test this conjecture, we investigate magnon injection and transport using the ferrimagnetic insulator Y3Fe5O12 as magnetic system. In detail, we use a superconducting niobium nitride (NbN) strip as the detector. A heater structure on top of the NbN allows to apply thermal gradient. A spatially separated heavy metal platinum strip acts as the injector of thermal magnon spin-currents. We present temperature dependent data to access the influence of superconducting quasiparticles on our transport signal.
[1] Jeon et al., ACS Nano 14, 15874, (2020).