Physics – Condensed Matter – Superconductivity
Scientific paper
2006-02-20
Physics
Condensed Matter
Superconductivity
7 pages, 5 figures, submitted to JETP Letters
Scientific paper
10.1134/S0021364006060038
Josephson current in SFcFS junctions with arbitrary transparency of the constriction (c) is investigated. The emphasis is done on the analysis of the supercurrent dependencies on the misorientation angle $\theta $ between the in-plane magnetizations of diffusive ferromagnetic layers (F). It is found that the current-phase relation $I(\phi)$ may be radically modified with the $\theta $ variation: the harmonic $I_{1}\sin \phi $ vanishes for definite value of $\theta $ provided for identical orientation of the magnetizations ($\theta =0$) the junction is in the $"\pi"$ state. The Josephson current may exhibit a nonmonotonic dependence on the misorientation angle both for realization of $"0 "$ and $"\pi "$ state at $\theta =0$. We also analyze the effect of exchange field induced enhancement of the critical current which may occur in definite range of $\theta $.
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