Oscillations of superconducting transition temperature in strong ferromagnet-superconductor bilayers

Abstract

The superconducting transition temperature Tc of a "clean ferromagnet-dirty superconductor" bilayer is calculated using boundary conditions derived for the quasiclassical Green's function. This combination corresponds to the majority of experiments, in which Fe, Ni, Co, or Gd are used as a material for the ferromagnetic layer. It is shown that Tc oscillates upon changing thickness of the ferromagnetic layer, in accordance with the experimental observations. © 2003 MAIK "Nauka/Interperiodica"