Mesoscopic Ferromagnet/Superconductor Junctions and the Proximity Effect

Details Mesoscopic Ferromagnet/Superconductor Junctions and the Proximity Effect Mesoscopic Ferromagnet/Superconductor Junctions and the Proximity Effect

2000-07-27

arxiv.org/abs/cond-mat/0007433v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 eps figs

Scientific paper

10.1103/PhysRevB.64.054505

We have measured the electrical transport of submicron ferromagnets (Ni) in contact with a mesoscopic superconductor (Al) for a range of interface resistances. In the geometry measured, the interface and the ferromagnet are measured separately. The ferromagnet itself shows no appreciable superconducting proximity effect, but the ferromagnet/superconductor interface exhibits strong temperature, field and current bias dependences. These effects are dependent on the local magnetic field distribution near the interface arising from the ferromagnet. We find that the temperature dependences may be fit to a modified version of the Blonder-Tinkham-Klapwijk theory for normal-superconductor transport.

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