Fizika Nizkikh Temperatur: Volume 46, Number 11 (November 2020), p. 1266-1275 ( to contents , go back )
Magnetic proximity effect in structures of multiband superconductor/ferromagnetic metal
E. A. Koshina
O.O. Galkin Donetsk Institute for Physics and Engineering, National Academy of Sciences of Ukraine, 46 Nauki Ave., Kyiv 03028, Ukraine
Received March 30, 2020, revised Jule 6, published online September 21, 2020
Magnetic рroximity effect in multiband superconductor/ferromagnetic metal (S/F) structures is discussed. In the case when transport properties of the both metals correspond to a diffusion type of conductivity, on the base of the Usadel equations analytical solutions obtained in some cases of boundary parameters magnitude it is shown that induced (proximity) magnetic characteristics reflect the multiband structure of the superconductor and essentially depend on the S/F boundary parameters for both bands and the F layer exchange interaction magnitude. Main manifestations of the magnetic proximity effect in different bands of the S layer have been considered. Namely: additional suppression of the order parameter near the S/F boundary, spin splitting of the quasiparticle density of states in the S layer, an appearance of local states inside the energy gap of the S layer, and induced magnetization of unpaired electrons in the S layer.
Key words: proximity effects, superconductor/ferromagnetic hetero-structures, multiband superconductor.