The role of the dopant and the substrate in the magnetism of Fe-doped SnO2 films

S. DUHALDE; F. GOLMAR; C.E. RODRÍGUEZ TORRES; A.F. CABRERA; F.H. SÁNCHEZ

San Sebastián-España

Congreso; III JOINT EUROPEAN MAGNETIC SYMPOSIA; 2006

Ferromagnetism in diluted magnetic oxides is one of the most interesting new problems in magnetism. Many research groups have focused on doping TiO2 and ZnO with transition metals. Much of the work has thus been concentrated on Co-doped TiO2 films, where the room temperature ferromagnetism has been confirmed for anatase and also for rutile films. However, the origin of magnetic response is still controversial. Recently, Co, Fe, Ni and Mn doped SnO2 have been explored and interesting results were reported, especially in the case of the Co doped system where a giant magnetic moment was found (7.5 mB/Co at. at room temperature) [1]. In order to study the role of dopants and substrates in the origin and significance of ferromagnetism, SnO2 thin films (with and without Fe), were grown by pulsed laser deposition (PLD) on (001) LaAlO3 and (001) SrTiO3 (STO) substrates. The crystallographic structure was determined by X-ray diffraction (XRD) and their magnetic properties were measured using a SQUID. [1] S.B. Ogale et. al., Phys. Rev. Let. 91 (2003) 077205.