Abstract
The theory of proximity effect for superconductor/ferromagnet (SC/FM) sandwiches is developed. The superconducting transition temperature T c of a sandwich is calculated taking into account the finite transparency of the SC/FM interface, the exchange splitting of conduction band and breaking of superconducting pairs in the ferromagnetic layer(s). It is found that in SC/FM bilayers and FM/SC/FM trilayers T c may exhibit nonmonotonic, oscillating or re-entrant behavior as a function of the ferromagnetic layer(s) thickness. The qualitative relevance of the theory to existing experiments is discussed. The experiment which allows one to distinguish the formation of ` π-phase' or `0-phase' in SC/FM multilayer systems is proposed.
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