Abstract
Electronic structure calculations on superlattices of iron on one side and alloys of Ge, GaAs, and ZnSe on the other side are reported. A very large spin polarization of conduction electrons is found, which is of opposite sign compared to the spin polarization of conduction electrons in bulk iron. The occurrence of almost 100% spin polarization is dependent on the thickness and composition of the insulator layer and on the thickness of the iron layer.
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