Exchange-field enhancement of superconducting spin pumping

Kun-Rok Jeon, Chiara Ciccarelli, Hidekazu Kurebayashi, Lesley F. Cohen, Xavier Montiel, Matthias Eschrig, Sachio Komori, Jason W. A. Robinson, and Mark G. Blamire
Phys. Rev. B 99, 024507 – Published 15 January 2019
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Abstract

A recent ferromagnetic resonance study [Jeon et al., Nat. Mater. 17, 499 (2018)] has reported that spin pumping into a singlet superconductor (Nb) can be greatly enhanced over the normal state when the Nb is coupled to a large spin-orbit-coupling (SOC) spin sink such as Pt. This behavior has been explained in terms of the generation of spin-polarized triplet supercurrents via SOC at the Nb/Pt interface, acting in conjunction with a nonlocally induced magnetic exchange field. Here we report the effect of adding a ferromagnet (Fe) to act as an internal source of an additional exchange field to the adjacent Pt spin sink. This dramatically enhances the spin pumping efficiency in the superconducting state compared with either Pt and Fe separately, demonstrating the critical role of the exchange field in generating superconducting spin currents in the Nb.

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  • Received 1 November 2018
  • Revised 19 December 2018

DOI:https://doi.org/10.1103/PhysRevB.99.024507

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kun-Rok Jeon1,2, Chiara Ciccarelli2,*, Hidekazu Kurebayashi3, Lesley F. Cohen4, Xavier Montiel5, Matthias Eschrig5, Sachio Komori1, Jason W. A. Robinson1, and Mark G. Blamire1,*

  • 1Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
  • 2Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
  • 3London Centre for Nanotechnology and Department of Electronic and Electrical Engineering at University of College London, London WC1H 01H, United Kingdom
  • 4The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
  • 5Department of Physics, Royal Holloway, University of London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom

  • *Authors to whom correspondence should be addressed: cc538@cam.ac.uk
  • mb52@cam.ac.uk

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Issue

Vol. 99, Iss. 2 — 1 January 2019

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