Abstract
The magnetotransport properties of ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}∕\mathrm{Co}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}∕\mathrm{Nb}(0.5%):\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ junctions were investigated. At low temperatures, these junctions show a magnetoresistance strongly dependent on current bias, temperature, and magnetic field. This is attributed to spin filtering in the $\mathrm{Co}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ layer. Moreover, the apparent coercive field of the junctions depends on the applied bias current due to the interplay of magnetic switching and the bias dependent transport in the $\mathrm{Co}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ layer.
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