The magnetic properties of anatase Ti1?xMnxO2 (0 < x < 0.06) films prepared by sol?gel spin coating annealed in air and vacuum have been investigated. Room temperature ferromagnetism was observed in all the films. Enhancement of ferromagnetism is revealed in the films annealed in vacuum. The magnetic moment of the films annealed in vacuum, at 300?K, is 0.285 ? 0.004 ?B/Mn for Ti0.9618Mn0.0382 O2 and 0.366 ? 0.005 ?B/Mn for Ti0.9409 Mn0.0591O2. It is believed that the enhanced ferromagnetism could be due to the formation of oxygen vacancies and/or defects.
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Xu et al. (2007) studied this question.
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