Critical current in SFIFS junctions

Details Critical current in SFIFS junctions Critical current in SFIFS junctions

2002-01-15

arxiv.org/abs/cond-mat/0201249v2

JETP Letters 75, 190 (2002) [Pis'ma v ZhETF 75, 223 (2002)]

Physics

Condensed Matter

Superconductivity

5 pages, 4 EPS figures; the style file jetpl.cls is included. Version 2: minor corrections

Scientific paper

10.1134/1.1475721

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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