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arXiv · 1902.03862

Abrikosov vortex nucleation and its detrimental effect on superconducting spin pumping in Pt/Nb/Ni80Fe20/Nb/Pt proximity structures

Kun-Rok Jeon·Chiara Ciccarelli·Hidekazu Kurebayashi·Lesley F. Cohen·Sachio Komori·Jason W. A. Robinson·Mark G. Blamire
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Abstract

We report Abrikosov vortex nucleation in Pt/Nb/Ni80Fe20/Nb/Pt proximity-coupled structures under oblique ferromagnetic resonance (FMR) that turns out to be detrimental to superconducting spin pumping. By measuring an out-of-plane field-angle {\theta}H dependence and comparison with Pt-absent control samples, we show that as {\theta}H increases, the degree of enhancement (suppression) of spin pumping efficiency in the superconducting state for the Pt-present (Pt-absent) sample diminishes and it reverts to the normal state value at {\theta}H = 90{\deg}. This can be explained in terms of a substantial out-of-plane component of the resonance field for the Ni80Fe20 layer (with in-plane magnetization anisotropy and high aspect ratio) that approaches the upper critical field of the Nb, turning a large fraction of the singlet superconductor volume into the normal state.

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Kun-Rok Jeon, Chiara Ciccarelli, Hidekazu Kurebayashi, Lesley F. Cohen, Sachio Komori, Jason W. A. Robinson, Mark G. Blamire. 2019-02-11. Abrikosov vortex nucleation and its detrimental effect on superconducting spin pumping in Pt/Nb/Ni80Fe20/Nb/Pt proximity structures. https://doi.org/10.1103/physrevb.99.144503

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