Spin-Pumping-Induced Inverse Spin Hall Effect in Nb/Ni80Fe20 Bilayers and its Strong Decay Across the Superconducting Transition Temperatureopen access
- Authors
- Jeon, Kun-Rok; Ciccarelli, Chiara; Kurebayashi, Hidekazu; Wunderlich, Jöerg; Cohen, Lesley F.; Komori, Sachio; Robinson, Jason W.A.; Blamire, Mark G.
- Issue Date
- Jul-2018
- Publisher
- American Physical Society
- Citation
- Physical Review Applied, v.10, no.1
- Journal Title
- Physical Review Applied
- Volume
- 10
- Number
- 1
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/63858
- DOI
- 10.1103/PhysRevApplied.10.014029
- ISSN
- 2331-7019
2331-7019
- 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. © 2018 American Physical Society.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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