Room temperature ferromagnetism (FM) was observed in laser ablated undoped SnO2 thin films grown on LaAlO3 substrates (the saturated magnetization is about 12 emu/cm(3), as half of that of the TiO2 films with the same thickness). Experiments on Mn-doped SnO2 films show that a transition-metal doping does not play any key role in introducing FM in the system. Mn doping (even if with a small content), in fact, just degrades the structure of the SnO2 host and, as a consequence, reduces its magnetic moment. Both oxygen vacancies and confinement effects are assumed to be key factors in introducing magnetic ordering into SnO2.
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