Magnetic proximity effect in structures of multiband superconductor/ferromagnetic metal

Magnetic proximity 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. (author)