Mn was doped into TiO2 to clarify the real effects of Mn doping on magnetic and structural properties of TiO2 thin films. Mn doping does not play any key role in introducing ferromagnetism (FM) in the system. When the dopant concentration is small (below 5%), the Mn atoms can still be substituted for Ti atoms and maintain the TiO2 structure, so that it enhances the magnetic moment of the TiO2 host to some extent. When the dopant content increases to larger than 10%, along with a destruction of the anatase structure, the Mn doping consequently degrades and then destroys the FM of the host.
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Hong et al. (2006) studied this question.
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