Spin filtering in La0.7Sr0.3MnO3/CoFe2O4/Nb(0.5%):SrTiO3 heterostructures

Phys. Rev. B 76, 014426 (2007)

Y. F. Chen and M. Ziese


The magnetotransport properties of La0.7Sr0.3MnO3∕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.