Critical current in SFIFS junctions 
A. A. Golubov^{+}, M. Yu. Kupriyanov^{* 1)}, Ya. V. Fominov
^{+} Department of Applied Physics, University of Twente, 7500 AE, Enschede, The Netherlands ^{*} Nuclear Physics Institute, M. V. Lomonosov Moscow State University, 119899 Moscow, Russia L. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia

PACS: 74.50.+r, 74.80.Dm, 75.30.Et

Abstract
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 selfconsistent numerical
procedure is employed to solve the Usadel equations at arbitrary values of
the Flayers thicknesses, magnetizations, and interface parameters. In the
case of antiparallel ferromagnets magnetizations the effect of the critical
current I_{c} enhancement by the exchange energy H is observed, while in
the case of parallel magnetizations the junction exhibits the transition to
the πstate. In the limit of thin Flayers, we study these peculiarities
of the critical current analytically and explain them qualitatively; the
scenario of the 0π transition in our case differs from those studied
before. The effect of switching between 0 and π states by changing the
Flayers mutual orientation is demonstrated.


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