Ferromagnetism in doped-TiO2 thin films

STELLA DUHALDE; CLAUDIA RODRÍGUEZ TORRES; MARÍA FLORENCIA VIGNOLO; F. GOLMAR; CLAUDIO CHILLOTE; ALEJANDRA CABRERA; FRANCISCO SÁNCHEZ.

Journal of Physics: Conference Series

Año: 2007 vol. 59 p. 479 - 482

1742-6588

Transition-Metal-doped TiO2 thin films, with nominal composition Ti0.9TM0.1O2-�� 2 thin films,  (TM = Mn, Fe, Co, Ni, Cu), were grown by pulsed laser deposition (PLD), in order to study the role of dopants in the origin and significance of room temperature ferromagnetism in these systems. The crystallographic structures and their magnetic properties were characterized and the experimental results are compared to ab-initio calculations previously reported. The films are ferromagnetic at room temperature in the cases of Fe, Co, Ni and even Cu impurities, but not in the case of Mn doping. Our results support the hypothesis that oxygen vacancies play a key role in the origin of magnetism in doped TiO2 films, and can explain the diversity of magnetic moments observed experimentally for films grown under different conditions.