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We quantify the spin Hall angle θ SH  and spin-diffusion length l sd  of Nb  from inverse spin Hall effect (ISHE) measurements in Nb / Ni 80 Fe 20  bilayers under ferromagnetic resonance. By varying the Nb thickness t Nb  and comparing to a Ni 80 Fe 20 / Pt  reference sample, room temperature values of θ SH  and l sd  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 t Nb . Above the superconducting transition temperature T c  of Nb  , a clear t Nb -dependent T evolution of the ISHE is observed whereas below T c , 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 T c , 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.

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Spin-Pumping-Induced Inverse Spin Hall Effect in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Nb</mml:mi><mml:mo>/</mml:mo><mml:msub><mml:mi>Ni</mml:mi><mml:mn>80</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>20</mml:mn></mml:msub></mml:math> Bilayers and its Strong Decay Across the Superconducting Transition Temperature

Spin-Pumping-Induced Inverse Spin Hall Effect in Nb/Ni80Fe20 Bilayers and its Strong Decay Across the Superconducting Transition Temperature