Abstract
The tunneling spin polarization of CoFe, NiFe, and pure Ni was measured using superconducting tunneling spectroscopy for Al2O3 tunnel barriers with the ferromagnetic material both above and below the barrier. The spin polarization was found to be very similar for Co–Fe in both cases but for Ni and Ni–Fe alloys the spin polarization was significantly lower when the Al2O3 barrier was deposited on top of the ferromagnetic material. We attribute this to oxidation of the ferromagnet at the ferromagnet/Al2O3 interface resulting from an imperfect formation of the barrier.
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