Probe of spin dynamics in superconducting NbN thin films via spin pumping

ORAL

Abstract

The emerging field of superconductor (SC) spintronics has attracted intensive attentions recently. Many fantastic spin-dependent properties in SCs have been discovered, including large magnetoresistance, long spin lifetimes, and the giant spin Hall effect, etc. Regarding the spin dynamics in superconducting thin films, few studies have been reported yet. Here, we report the investigation of the spin dynamics in an s-wave superconducting NbN film via spin pumping from an adjacent insulating ferromagnet GdN film. A profound coherence peak of the Gilbert damping of GdN is observed slightly below the superconducting critical temperature of the NbN, which agrees well with recent theoretical prediction fors-wave SCs in the presence of impurity spin-orbit scattering. This observation is also a manifestation of the dynamic spin injection into superconducting NbN thin film. Our results demonstrate that spin pumping could be used to probe the dynamic spin susceptibility of superconducting thin films, thus pave the way for future investigation of spin dynamics of interfacial and two-dimensional crystalline SCs.

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Presenters

  • Yunyan Yao

    International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics , Peking University, Beijing

Authors

  • Yunyan Yao

    International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics , Peking University, Beijing

  • Qi Song

    International Center for Quantum Materials, School of Physics , Peking University, Beijing

  • Yota Takamura

    Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology

  • Juan Pedro Cascales

    Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology

  • Wei Yuan

    International Center for Quantum Materials, School of Physics , Peking University, Beijing, Physics and Astronomy, University of California, Riverside, University of California, Riverside, Physics and Astronomy, UC riverside

  • Yang Ma

    International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics , Peking University, Beijing

  • Yu Yun

    International Center for Quantum Materials, School of Physics , Peking University, Beijing

  • Xincheng Xie

    International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics , Peking University, Beijing, International Center for Quantum Materials, School of Physics, Peking University, Beijing, China

  • Jagadeesh Moodera

    Dept. Of Physics, Plasma Science and Fusion Center and Francis Bitter Magnet Lab, Massachusetts Institute of Technology, MIT, Department of Physics, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Department of Physics, Plasma Science and Fusion Center, and Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT, Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, and Department of Physics, MIT, Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Physics, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology, Department of Physics, MIT, Cambridge, MA, 02139

  • Wei Han

    International Center for Quantum Materials, Peking University, International Center for Quantum Materials, School of Physics , Peking University, Beijing