Abstract
Spin polarization and electronic structure of Co90Fe10 were investigated through tunneling magnetoresistance (TMR) effect measurements on the Mn80Ir20/Ni80Fe20/Co90Fe10/SrTiO3/La0.7Sr0.3MnO3 junction. This junction was fabricated with half-metallic ferromagneto-LSMO and has a spin-valve type structure. An inverse TMR of 14 % was observed at 4.2 K. As the spin polarization of the LSMO is positive, the inverse TMR observed in this junction indicates a negative polarization for Co90Fe10 at the interface. The bias dependence of TMR is asymmetric to the applied bias. The band structure calculated with the LMTO-CPA method showed that spin polarization for Co90Fe10 is negative at the Fermi level.
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