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Exchange-field enhancement of superconducting spin pumping

Jeon, K-R; Ciccarelli, C; Kurebayashi, H; Cohen, LF; Montiel, X; Eschrig, M; Komori, S; ... Blamire, MG; + view all (2019) Exchange-field enhancement of superconducting spin pumping. Physical Review B , 99 (2) , Article 024507. 10.1103/PhysRevB.99.024507. Green open access

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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.

Type: Article
Title: Exchange-field enhancement of superconducting spin pumping
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.99.024507
Publisher version: http://doi.org/10.1103/PhysRevB.99.024507
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10067242
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