Abstract
We herein investigated the magnetic moment of thickness-dependent SnO2 films at room temperature. The saturation magnetization of SnO2 films grown on the r-plane sapphire substrate was decreased with increasing the film thickness. An areal saturation magnetization, a magnetic moment in the unit surface area, did not vary with increasing film thickness. Hall effect measurement indicated that the charge carrier from oxygen vacancy was presented in the epitaxial SnO2 films. Furthermore, X-ray photoelectron spectroscopy analysis revealed that the oxygen vacancy profiles were consistent with that of magnetization. These results suggest that oxygen vacancies at the surface region are the source of the magnetic moment in SnO2 films.
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