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Thickness dependence of the Josephson ground States of superconductor-ferromagnet-superconductor junctions
V A Oboznov1, V V Bol'ginov, A K Feofanov
1Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka.
Abstract:
We report the first experimental observation of the two-node thickness dependence of the critical current in Josephson junctions with a ferromagnetic interlayer. Nodes of the critical current correspond to the transitions into the pi state and back into the conventional 0 state. From the experimental data the superconducting order parameter oscillation period and the pair decay length in the ferromagnet are extracted reliably. We develop a theoretical approach based on the Usadel equations taking into account the spin-flip scattering. Results of numerical calculations are in good agreement with experiments.
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