Abstract
We have fabricated oxide-based spin-filter junctions in which we demonstrate that magnetic anisotropy can be used to tune the transport behavior of spin-filter junctions. We have demonstrated spin-filtering behavior in La${}_{0.7}$Sr${}_{0.3}$MnO${}_{3}$/CoCr${}_{2}$O${}_{4}$/Fe${}_{3}$O${}_{4}$ and La${}_{0.7}$Sr${}_{0.3}$MnO${}_{3}$/MnCr${}_{2}$O${}_{4}$/Fe${}_{3}$O${}_{4}$ junctions where the interface anisotropy plays a significant role in determining transport behavior. Detailed studies of chemical and magnetic structure at the interfaces indicate that abrupt changes in magnetic anisotropy across the nonisostructural interface is the cause of the significant suppression of junction magnetoresistance in junctions with MnCr${}_{2}$O${}_{4}$ barrier layers.
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