  The superconducting and magnetic properties of the (Fe/Cr/Fe)/V/Fe layered
system with variable thickness of the chromium layer have been experimentally
and theoretically studied. The magnetic properties of the system have been
studied by the ferromagnetic resonance method, and the superconducting
transition temperature has been measured from the jump in the magnetic
susceptibility. A wide variety of magnetic states are observed in the system;
in particular, the structure of small domains can arise in the iron layer
placed between vanadium and chromium. It has been shown experimentally that the
critical temperature $T_c$ of the superconducting transition undergoes
nonmonotonic oscillations with a noticeable amplitude in the given system with
the change in the thickness of the Cr layer. The proposed model based on the
proximity effect theory makes it possible to relate these $T_c$ oscillations to
the features of the magnetic structure of the samples.
