Spin polarized current and Andreev transmission in planar   superconducting-ferromagnetic Nb-Ni junctions
  We have measured and modeled, using three different approaches, the tunneling current in a Nb/NbxOy/Ni planar tunnel junction. The experimental data could be fitted and the correct current polarization could be extracted using a simple quasiclassical model, even in the absence of an applied magnetic field. We also discuss the microscopic structure of the barrier. 
E. M. Gonzalez, A. Dominguez-Folgueras, F. J. Palomares, R. Escudero,   J. E. Villegas, J. M. Gonzalez, J. Ferrer, F. Guinea...