Spin-pumping-induced inverse spin hall effect in Nb/Ni80Fe20 bilayers and its strong decay across the superconducting transition temperature
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
We quantify the spin Hall angle θSH and spin-diffusion length lsd of Nb from inverse spin Hall effect (ISHE) measurements in Nb/Ni80Fe20 bilayers under ferromagnetic resonance. By varying the Nb thickness tNb and comparing to a Ni80Fe20/Pt reference sample, room temperature values of θSH and lsd for Nb are estimated to be approximately −0.001 and 30 nm, respectively. We also investigate the ISHE as a function of temperature T for different tNb. Above the superconducting transition temperature Tc of Nb , a clear tNb-dependent T evolution of the ISHE is observed whereas below Tc, the ISHE voltage drops rapidly and is below the sensitivity of our measurement setup at a lower T. This suggests the strong decay of the quasiparticle (QP) charge-imbalance relaxation length across Tc, as supported by an additional investigation of the ISHE in a different sample geometry along with model calculation. Our finding suggests careful consideration should be made when developing superconductor spin Hall devices that intend to utilize QP-mediated spin-to-charge interconversion.
Date Issued
2018-07
Date Acceptance
2018-05-28
Citation
Physical Review Applied, 2018, 10 (1)
ISSN
2331-7019
Publisher
American Physical Society
Journal / Book Title
Physical Review Applied
Volume
10
Issue
1
Copyright Statement
© 2018 American Physical Society.
Sponsor
The Leverhulme Trust
Engineering & Physical Science Research Council (E
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000439986200002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
RPG-2016-306
RG81276
Subjects
Science & Technology
Physical Sciences
Physics, Applied
Physics
ROOM-TEMPERATURE
CONVERSION
Publication Status
Published
Article Number
014029
Date Publish Online
2018-07-27