Spin polarized current and Andreev transmission in planar superconducting/ferromagnetic Nb/Ni junctions

Details Spin polarized current and Andreev transmission in planar superconducting/ferromagnetic Nb/Ni junctions Spin polarized current and Andreev transmission in planar superconducting/ferromagnetic Nb/Ni junctions

2008-10-06

arxiv.org/abs/0810.0929v1

New Journal of Physics 9, 34 (2007)

Physics

Condensed Matter

Superconductivity

12 pages, 6 figures

Scientific paper

10.1088/1367-2630/9/2/034

We have measured the tunnelling current in Nb/Nb$_x$O$_y$/Ni planar tunnel junctions at different temperatures. The junctions are in the intermediate transparency regime. We have extracted the current polarization of the metal/ferromagnet junction without applying a magnetic field. We have used a simple theoretical model, that provides consistent fitting parameters for the whole range of temperatures analyzed. We have also been able to gain insight into the microscopic structure of the oxide barriers of our junctions.%

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