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In this work we study the electronic structure and magnetism of a TiO2 filmgrown on another non-magnetic oxide such as a LaAlO3 (001) substrate,concentrating on the role played by structural relaxation and oxygen vacancies.Using Density Functional Theory ab-initio methods, we study the free-standinganatase film as well as the interfaces with either the LaO or AlO2 planes ofLaAlO3, focusing on the possibility of magnetic solutions. Our results showthat the interface LaO/TiO2 is favored against the AlO2/TiO2 one if no oxygenvacancies are present in the interface whereas the contrary happens when thereare oxygen vacancies. In both cases, the cohesive energy is of the same orderof magnitude but only the AlO2/TiO2 interface presents an stable magneticsolution.

Magnetism in a TiO2/LaAlO3 heterostructure: an ab initio study about the role of oxygen vacancies