Electron transport in a mesoscopic superconducting / ferromagnetic hybrid conductor

Details Electron transport in a mesoscopic superconducting / ferromagnetic hybrid conductor Electron transport in a mesoscopic superconducting / ferromagnetic hybrid conductor

2002-04-05

arxiv.org/abs/cond-mat/0204140v2

Eur. Phys. J. B 31, 103 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures, final version

Scientific paper

10.1140/epjb/e2003-00014-x

We present electrical transport experiments performed on submicron hybrid devices made of a ferromagnetic conductor (Co) and a superconducting (Al) electrode. The sample was patterned in order to separate the contributions of the Co conductor and of the Co-Al interface. We observed a strong influence of the Al electrode superconductivity on the resistance of the Co conductor. This effect is large only when the interface is highly transparent. We characterized the dependence of the observed resistance decrease on temperature, bias current and magnetic field. As the differential resistance of the ferromagnet exhibits a non-trivial asymmetry, we claim that the magnetic domain structure plays an important role in the electron transport properties of superconducting / ferromagnetic conductors.

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