SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 16: PhD Focus Session: Symposium on Strange Bedfellows - Magnetism Meets Superconductivity" (joint session MA/AKjDPG) (joint session MA/TT)

TT 16.6: Talk

Thursday, September 30, 2021, 12:00–12:15, H5

Temperature-Dependent Spin Transport and Current- Induced Torques in Superconductor-Ferromagnet Heterostructures — •Manuel Müller^1,2, Lukas Liensberger^1,2, Luis Flacke^1,2, Hans Huebl^1,2,3, Akashdeep Kamra⁴, Wolfgang Belzig⁵, Rudolf Gross^1,2,3, Mathias Weiler^1,2,6, and Matthias Althammer^1,2 — ¹Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Physik- Department, Technische Universität München, Garching, Germany — ³Munich Center for Quantum Science and Technology (MCQST), München, Germany — ⁴Norwegian University of Science and Technology, Trondheim, Norway — ⁵Physik-Department, Universität Konstanz, Konstanz, Germany — ⁶Fachbereich Physik, TU Kaiserslautern, Kaiserslautern, Germany

Proximity effects at superconductor(SC)/ferromagnet(FM) interfaces provide novel functionality in superconducting spintronics. We investigate the injection of spin currents in NbN/permalloy (Py) heterostructures with and without a Pt spin sink layer. Spin currents are excited by broadband ferromagnetic resonance in the Py-layer coupled inductively to a coplanar waveguide and quantitative information on the spin current physics is obtained by measuring the complex microwave transmission as a function of temperature. Our findings, reveal the symmetry and strength of spin-to-charge current conversion in SC/FM heterostructures and provide guidance for future superconducting spintronics devices. Our results are published in Phys. Rev. Lett. 126, 087201 (2021). We acknowledge financial support by the DFG.