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

T. Kato; Y. Ohnuma; M. Matsuo; J. Rech; T. Jonckheere; T. Martin

doi:10.1103/PhysRevB.99.144411

← Back to search

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

T. Kato, Y. Ohnuma, M. Matsuo, J. Rech, T. Jonckheere, T. Martin

DOI 10.1103/PhysRevB.99.144411 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We theoretically investigate spin transport at the interface between a 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 nonequilibrium states induced by the spin pumping and compare them quantitatively for an yttrium iron garnet–NbN interface.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown