Microscopic theory of spin transport at the interface between the superconductor and a ferromagnetic insulator

Abstract

We theoretically investigate spin transport at the interface between the ferromagnetic insulator(FI) and a superconductor(SC). Considering a simple FI-SC interface model, we derive formulas for the spin current and spin-current noise induced by microwave irradiation (spin pumping) or the temperature gradient (the spin Seebeck effect). We show how the superconducting coherence factor affects the temperature dependence of the spin current. We also calculate the spin-current noise in thermal equilibrium and in non-equilibrium states induced by the spin pumping, and compare them quantitatively for an yttrium-iron-garnet-NbN interface.

9 pages, 6 figures

References in corpus (13)

• Spin Seebeck insulator
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• Theory of magnon-driven spin Seebeck effect
• Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc
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• Theory of spin Peltier effect
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• Noise in mesoscopic physics
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Cited by in corpus (5)

• Ferromagnetic resonance modulation in $d$-wave superconductor/ferromagnetic insulator bilayer systems
• Spin current at a magnetic junction as a probe of the Kondo state
• Spin-pumping in superconductor-antiferromagnetic insulator bilayers
• Unified formulation of interfacial magnonic pumping from non-collinear magnets
• Spin Hall effect generated by fluctuating vortices in type-II superconductors