Spin transport parameters of NbN thin films characterised by spin pumping experiments

Abstract

We present measurements of ferromagnetic-resonance - driven spin pumping and inverse spin-Hall effect in NbN/Y3Fe5O12 (YIG) bilayers. A clear enhancement of the (effective) Gilbert damping constant of the thin-film YIG was observed due to the presence of the NbN spin sink. By varying the NbN thickness and employing spin-diffusion theory, we have estimated the room temperature values of the spin diffusion length and the spin Hall angle in NbN to be 14 nm and -1.1 10-2, respectively. Furthermore, we have determined the spin-mixing conductance of the NbN/YIG interface to be 10 nm-2. The experimental quantification of these spin transport parameters is an important step towards the development of superconducting spintronic devices involving NbN thin films.

References in corpus (4)

• Direct electronic measurement of the spin Hall effect
• Observation of inverse spin Hall effect in bismuth selenide
• Negative nonlocal resistance in mesoscopic gold Hall bars: Absence of giant spin Hall effect
• Eddy current interactions in a Ferromagnet-Normal metal bilayer structure, and its impact on ferromagnetic resonance lineshapes

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• Spin Hall effect generated by fluctuating vortices in type-II superconductors