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VOLUME 55 (1992) | ISSUE 7 | PAGE 384
Polarization states in the energy gap of superconductor-ferromagnet superlattices
The spectrum of excitations of S /Fand S /1(F) superlattices is derived [Sis a superconductor, .Fis a ferromagnetic metal, and 1(F) is a ferromagnetic insulator]. Narrow Bloch bands of quasiparticle states with one spin orientation exist in the energy gap of superlattices of both types (only under certain conditions, in the case of the S/F superlattice). The Bloch bands of an S /1(F) superlattice are unusual in that their width is a rapidly oscillating function of the thickness of the superconducting layer.