From inversion to enhancement of the dc Josephson current in S/F−I−F/S tunnel structures

V. N. Krivoruchko; E. A. Koshina

doi:10.1103/PhysRevB.64.172511

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From inversion to enhancement of the dc Josephson current in S/F−I−F/S tunnel structures

V. N. Krivoruchko, E. A. Koshina

DOI 10.1103/PhysRevB.64.172511 · Physical Review B

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Abstract

The dependence of the critical current on relative orientation of the F layers magnetization is analyzed within the microscopic theory of the proximity effect for a junction of two proximity S/F bilayers of a massive superconductor (S) / a thin ferromagnet (F) separated by an insulating (I) barrier. We demonstrate that for the S/F−I−F/S contact critical current can reverse its sign (π-state of the junction) for the parallel orientation of the F layers magnetization, while for antiparallel alignment an enhancement of the critical current takes place.