Evidence of half-metallic-2DHG at BiFeO3 based heterointerfaces

Abstract

Abstract The electronic properties of tetragonal BiFeO3 based hetero-structures, along with the tetragonal phase of SrTiO3 and PbTiO3 in (001) direction, is investigated with two types of interfaces. In the case of BiFeO3/SrTiO3(001) hetero-structure, the (FeO2)−/(SrO)0, and (BiO)+/(TiO2)0 interfaces are investigated respectively. For BiFeO3/PbTiO3(001) hetero-structure, the (FeO2)−/(PbO)0, and (BiO)+ / (TiO2)0 interfaces are studied. A tiny amount of half-metallicity has been found in the (FeO2)−/(SrO)0 interface while (BiO)+/(TiO2)0 interface behaves as metallic in the case of BiFeO3/SrTiO3(001) heterostructure. However, interestingly, (FeO2)−/(PbO)0 interface turns out to be a prominent half-metal with hole-type charge carriers, and (BiO)+/(TiO2)0 exhibits two-dimensional electron gas in the case of BiFeO3/PbTiO3(001).