Ferromagnetism at 300 K in spin-coated films of Co doped anatase and   rutile TiO2
  Thin films of Ti1-xCoxO2 (x=0 and 0.03) have been prepared on sapphire substrates by spin-on technique starting from metalorganic precursors. When heat treated in air at 550 and 700 C respectively, these films present pure anatase and rutile structures as shown both by X-ray diffraction and Raman spectroscopy. Optical absorption indicate a high degree of transparency in the visible region. Such films show a very small magnetic moment at 300 K. However, when the anatase and the rutile films are annealed in a vacuum of 1x10-5 Torr at 500 oC and 600 oC respectively, the magnetic moment, at 300 K, is strongly enhanced reaching 0.36 &#61549;B/Co for the anatase sample and 0.68 &#61549;B/Co for the rutile one. The ferromagnetic Curie temperature of these samples is above 350 K. 
R. Suryanarayanan, Vaman Naik, Parasuram Kharel, Punya Talgala, Ratna   Naik