  A nonmonotonic dependence of the critical Josephson supercurrent on the
injection current through a normal metal/ferromagnet weak link from a single
domain ferromagnetic strip has been observed experimentally in nanofabricated
planar crosslike S-N/F-S Josephson structures. This behavior is explained by
0-pi and pi-0 transitions, which can be caused by the suppression and Zeeman
splitting of the induced superconductivity due to interaction between N and F
layers, and the injection of spin-polarized current into the weak link. A model
considering both effects has been developed. It shows the qualitative agreement
between the experimental results and the theoretical model in terms of spectral
supercurrent-carrying density of states of S-N/F-S structure and the
spin-dependent double-step nonequilibrium quasiparticle distribution.
