Ferromagnetism at 300 K in spin-coated films of Co doped anatase and rutile-TiO2 |
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Authors: | R Suryanarayanan VM Naik P Talagala |
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Institution: | a Department of Physics and Astronomy, Wayne State University, 666 W Hancock, Detroit, MI 48201, USA b Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI 48128, USA |
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Abstract: | 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 1×10−5 Torr at 500 and 600 °C, respectively, the magnetic moment, at 300 K, is strongly enhanced reaching 0.36μB/Co for the anatase sample and 0.68μB/Co for the rutile one. The ferromagnetic Curie temperature of these samples is above 350 K. |
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Keywords: | 75 60 78 20 &minus e 78 30 &minus j 77 84 Bw |
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