Electronic structure and spin-filter effect of ferromagnetic insulators with double perovskite structure

Abstract We study the electronic structure of double perovskite oxide La 2 NiMnO 6 and spin-dependent tunnel conductance in LaNiO 3 / La 2 NiMnO 6 / LaNiO 3 junction. By performing first principles calculations (DFT-GGA), it is shown that La 2 NiMnO 6 is a ferromagnetic insulator and the barrier height is spin-independent. In LaNiO 3 / La 2 NiMnO 6 / LaNiO 3 junction, a large spin-filter effect is obtained since the exponential decay rate of the wave function in the barrier is spin-dependent.