Spin polarization in ferromagnet/insulator/superconductor structures with the superconductor on top of the barrier

Kaiser, C.; Parkin, S.S.P.
May 2004
Applied Physics Letters;5/3/2004, Vol. 84 Issue 18, p3582
Academic Journal
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. © 2004 American Institute of Physics.


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