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Critical current in SFIFS junctions

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arxiv cond-mat/0201249 v2 pith:G3FFIKZB submitted 2002-01-15 cond-mat.supr-con cond-mat.mes-hall

A. A. Golubov , M. Yu. Kupriyanov , Ya. V. Fominov This is my paper · ORCID
classification cond-mat.supr-concond-mat.mes-hall
keywords casecriticalcurrenteffectmagnetizationsf-layersjunctionslimit
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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 enhancement by the exchange field is observed, while in the case of parallel magnetizations the junction exhibits the transition to the pi-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-pi transition in our case differs from those studied before. The effect of switching between 0 and pi states by changing the F-layers' mutual orientation is demonstrated.

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  1. Quantized resonant tunneling effect in Josephson junctions with ferromagnetic bilayers

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    In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting t...

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