Proximity effects in structures of multiband superconductor–ferromagnetic metal
E.A. Koshina and V.N. Krivoruchko
O.O. Galkin Donetsk Institute for Physics and Engineering NAS of Ukraine, Kyiv 03680, Ukraine
Received November 11, 2016
Proximity effects in multiband superconductor/ferromagnetic metal (S/F) structures are discussed. In the limit when transport properties of the both metals correspond to a diffusion type of conductivity, the quasi-classical Uzadel equations and related boundary conditions are formulated. The analytical solutions of the Uzadel equations are obtained in some cases of boundary parameters magnitude. It is shown that induced (proximity) characteristics reflect the multiband structure of the superconductor and essentially depend on the SF boundary parameters and the F layer ex-change interaction magnitude. Main manifestations of the magnetic proximity effect in the S layer have been considered. Namely: additional suppression of the order parameter near the SF 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.
PACS: 74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions; PACS: 74.78.Fk Multilayers, superlattices, heterostructures.