Temperature-dependent spin-transport and current-induced torques in superconductor/ferromagnet heterostructures

ORAL

Abstract

Proximity effects at superconductor(SC)/ferromagnet(FM) interfaces provide novel functionality in the field of superconducting spintronics. We investigate the injection of quasiparticle spin currents in a NbN/Permalloy (Py) heterostructures with a Pt spin sink layer. To this end, we excite ferromagnetic resonance in the Py-layer via the microwave driving field of a coplanar waveguide (CPW). A phase sensitive detection of the microwave transmission signal is used to quantitatively extract the inductive coupling strength between sample and CPW as a function of temperature [1]. Below the superconducting transition temperature Tc, we observe a blocking effect of pure spin current transport in the NbN layer. Moreover, below Tc we find a large field-like current-induced torque. Our findings, reveal symmetry and strength of spin-to-charge current conversion in SC/FM heterostructures and provide guidance for future superconducting spintronics devices [2].

[1] A. Berger et al., Phys. Rev. B 97: 94407. (2018).
[2] M. Müller et al., arXiv:2007.15569.(2020).

*We acknowledge financial support by the DFG via Germany’s Excellence Strategy EXC-2111-390814868.

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Presenters

  • Manuel Müller

    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
    • Walther Meissner Institute

Authors

  • Manuel Müller

    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
    • Walther Meissner Institute

  • Lukas Liensberger

    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
    • Walther Meißner Institut

  • Luis Flacke

    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany

  • Hans Huebl

    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
    • Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities, Garching, Germany

  • Akashdeep Kamra

    • 4Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway
    • Center for Quantum Spintronics, Norwegian University of Science and Technology

  • Wolfgang Belzig

    • Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
    • University of Konstanz
    • Physics, University of Konstanz

  • Rudolf Gross

    • Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
    • Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities, Garching, Germany
    • Walther Meißner Institut
    • Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany

  • Mathias Weiler

    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany

  • Matthias Althammer

    • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
    • Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities, Garching, Germany
    • Walther Meissner Institute