Exchange-field enhancement of superconducting spin pumping

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Title: Exchange-field enhancement of superconducting spin pumping
Authors: Jeon, K-R
Ciccarelli, C
Kurebayashi, H
Cohen, LF
Montiel, X
Eschrig, M
Komori, S
Robinson, JWA
Blamire, MG
Item Type: Journal Article
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.
Issue Date: 1-Jan-2019
Date of Acceptance: 22-Dec-2018
ISSN: 2469-9950
Publisher: American Physical Society (APS)
Journal / Book Title: Physical Review B
Volume: 99
Issue: 2
Copyright Statement: © 2019 American Physical Society.
Sponsor/Funder: The Leverhulme Trust
Engineering & Physical Science Research Council (E
Funder's Grant Number: RPG-2016-306
Keywords: Science & Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Materials Science
Publication Status: Published
Article Number: 024507
Online Publication Date: 2019-01-15
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences

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