Abstract
Tunnel magnetoresistance and spin polarization in (Ni-Co)/Al2O3/(Ni-Co) tunnel junctions are studied in the framework of the linear response theory. The multi-orbital tight-binding model is used to take account of the realistic band structure of the ferromagnets. The results show a small negative spin polarization and a magnetoresistance ratio of less than one percent. It is argued that the electronic structure of Al atom oxidized incompletely at interfaces is the origin of the positive spin polarization and the large magnetoresistance ratio.
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