Experimental and first principle study of room temperature ferromagnetism in carbon-doped rutile TiO2

Abstract

Room temperature ferromagnetism has been observed experimentally by implanting 1.2 MeV carbon on rutile TiO2. Density functional theory has been employed to study the magnetic properties of different possible carbon-related defects in TiO2. Theoretical calculation suggests carbon-doped at oxygen site (CO) can induce a significant magnetic moment in rutile TiO2. The 2p orbital electrons of the carbon atom are the primary source of the induced magnetic moment in TiO2. The magnetic measurements using a SQUID magnetometer, at room temperature, confirmed the ferromagnetic behavior of carbon doped rutile TiO2 sample.