Abstract
The Josephson current is calculated in a SFNFS junction, which consists of two ferromagnetic layers (F) separated by a thin non-magnetic spacer (N) and connected to superconducting electrodes (S). Gorkov equations are solved taking into account the fact that s-d scattering is the main scattering mechanism in the 3d ferromagnetic metals and it effectively destroys BCS correlation. It allows us to consider both strong and weak exchange field I: Iτf >> 1 or Iτf << 1 (τf is the relaxation time in F-layers). It is shown that the critical current J oscillates as a function of F-layers thickness and the oscillation period depends only on I. The s-d scattering effectively acts as an additional to the exchange magnetic-field mechanism for the suppression of BCS correlation in the ferromagnet. The s-d scattering is shown to be the reason of suppression of the Josephson current enhancement in the antiparallel configuration.