Effects of Li intercalation on magnetic properties of Co-doped rutile TiO2

Abstract

We have investigated the electronic structures and magnetic properties of Li-intercalated Co-doped rutile TiO2. For non-intercalated Ti0.9375Co0.0625O2, the half-metallic and low-spin (similar to0.94 mu(B)/Co) ground state is obtained. By Li intercalation, Ti0.9375Co0.0625O2 becomes a paramagnetic insulator at the concentration of Li/Ti = 0.067. At the higher concentration of Li/Ti = 0.133, it becomes a paramagnetic metal. Hence, as in the transition metal doped anatase TiO2 case, we expect that the magnetic and transport properties of Co-doped rutile TiO2 can be controlled by an electric field.