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VOLUME 75 (2002) | ISSUE 4 | PAGE 223
Critical current in SFIFS junctions
PACS: 74.50.+r, 74.80.Dm, 75.30.Et
Quantitative theory of the Josephson effect in SFIFS junctions (S denotes bulk superconductor, F - metallic ferromagnet, I - insulating barrier) is presented in the dirty limit. Fully self-consistent numerical procedure is employed to solve the Usadel equations at arbitrary values of the F-layers thicknesses, magnetizations, and interface parameters. In the case of antiparallel ferromagnets magnetizations the effect of the critical current Ic enhancement by the exchange energy H is observed, while in the case of parallel magnetizations the junction exhibits the transition to the π-state. In the limit of thin F-layers, we study these peculiarities of the critical current analytically and explain them qualitatively; the scenario of the 0-π transition in our case differs from those studied before. The effect of switching between 0 and π states by changing the F-layers mutual orientation is demonstrated.