Ferromagnetic Resonance Properties of NbCrFeCrNb multilayer stacks

POSTER

Abstract

It is by now well established that the presence of a spatially varying magnetization at a SC/FM interface can generate long range spin-polarized triplet supercurrents into the FM via the proximity effect in combination with spin mixing and spin rotation processes. Indeed junctions made up of Nb/Cr/Fe/Cr/Nb layers have been shown to carry supercurrents through significant thicknesses of Fe, showing that this combination of layers supports the generation of long range spin triplet superconductivity [1]. Quite separately, it has been recently demonstrated that spin pumping by ferromagnetic resonance (FMR) of Py when embedded in a Pt/Nb/Py/Nb/Pt stack also supports the formation of long range triplet superconductivity [2]. The characteristic signature of a spin triplet supercurrent in the latter case was an anomalous broadening of the FMR linewidth below the superconducting critical temperature (TC). In the current work we report on the FMR properties of Nb/Cr/Fe/Cr/Nb stacks, to study the behaviour of the intrinsic linewidth above and below TC and to establish characteristics indicative of triplet superconductivity.
[1] J. W. A. Robinson et al., Physical Review B 89, 104505 (2014) [2] K-R Jeon et al., Nature Materials 17 499-503 (2018)

*Uk EPSRC SuperSpintronics Programme grant

Presenters

  • Alexander Chan

    • Blackett Laboratory, Imperial College London

Authors

  • Murat Cubukcu

    • London Centre for Nanotechnology, University College London

  • Sachio Komori

    • Department of Materials Science and Metallurgy, University of Cambridge
    • Department of material science and metallurgy, University of Cambridge

  • Alexander Vanstone

    • Blackett Laboratory, Imperial College London
    • Physics, Imperial College London

  • Juliet Johnson

    • Department of Materials Science and Metallurgy, University of Cambridge

  • Alexander Chan

    • Blackett Laboratory, Imperial College London

  • Kun-Rok Jeon

    • Department of Materials Science and Metallurgy, University of Cambridge

  • Mark Blamire

    • Department of Materials Science and Metallurgy, University of Cambridge

  • Jason Robinson

    • Department of Materials Science and Metallurgy, University of Cambridge
    • Department of material science and metallurgy, University of Cambridge

  • Lesley Cohen

    • Physics, Imperial College London
    • Blackett Laboratory, Imperial College London

  • HIdekazu Kurebayashi

    • London Centre for Nanotechnology, University College London
    • London Centre for Nanotechnology and Department of Physics and Astronomy, University College London