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

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arxiv 1901.02440 v2 pith:BQRGFS74 submitted 2019-01-08 cond-mat.mes-hall

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

T. Kato , Y. Ohnuma , M. Matsuo , J. Rech , T. Jonckheere , T. Martin This is my paper
classification cond-mat.mes-hall
keywords spininterfacecurrentferromagneticinducedinsulatornoisepumping
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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