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

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