Y. F. Chen and M. Ziese

The magnetotransport properties of La_0.7Sr_0.3MnO₃∕CoFe₂O₄∕Nb(0.5%):SrTiO₃ 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 CoFe₂O₄ 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 CoFe₂O₄ layer.