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Modulation of the dc Josephson current in pseudo-spin-valve Josephson multilayers

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The dependence of the critical Josephson current (IC) and magnetoresistance (MR) on the relative orientation of the ferromagnetic layers is investigated in current perpendicular to plane (CPP) measurements of superconductor/ferromagnetic (S/F) multilayers. Two different CuxNi1-x alloys were chosen so that alternate F-layers reversed at different applied magnetic fields and that the ferromagnetic coherence length was of the order of several nanometres. These structures show a significant CPP high-bias MR, which enables the magnetic state of the devices to be determined directly. We found that IC is substantially larger when the adjacent F-layers are aligned antiparallel compared to the case of parallel orientation. Since in a pseudo-spin-valve structure the relative F-layer orientation is approximately parallel for zero applied magnetic field, IC can experience an enhancement when a magnetic field is applied in the plane of the junction. The maximum change of IC corresponds to the maximum change of MR.

Document Type: Research Article


Publication date: June 1, 2005

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