  We study theoretically the influence of ferromagnetic metals on a
superconducting film in the clean limit. Using a self-consistent solution of
the Bogoliubov--de Gennes equation for a ferromagnet-superconductor-ferromagnet
double junction we calculate the pair potential and conductance spectra as a
function of the superconducting layer thickness $d$ for different strengths of
ferromagnets and interface transparencies. We find that the pair potential and
the critical temperature are weakly perturbed by the exchange interaction and
do not drop to zero for any finite $d$. On the other hand, for thin
superconducting films charge transport is spin polarized and exhibits a
significant dependence on the ferromagnetic strength and magnetization
alignment.
