  In the systems ferromagnet/superconductor ([Fe, Ni]/In), the temperature
dependent transport has been investigated within the temperature range
including superconducting transition temperature for Indium. It has been found
that when Indium becomes superconducting, the system resistance acquires two
positive additions. The first, numerically equal to the resistance of a
ferromagnet part, of order of a spin--polarized region in length, corresponds
to the manifestation of "spin accumulation" effect. The second agrees in
magnitude with an interference reduction in the ferromagnet conductance over
the coherence length for singlet "Andreev pairs" which is established by the
exchange field in the ferromagnet. From the experimental data, the degree of
current spin polarization, the coherence length in the exchange field, and the
lower limit of spin--relaxation length in Fe and Ni have been estimated.
