Ferromagnetism in laser deposited anatase Ti1-xCoxO2-δ films

S. R. Shinde, S. B. Ogale, S. Das Sarma, J. R. Simpson, H. D. Drew, S. E. Lofland, C. Lanci, J. P. Buban, N. D. Browning, V. N. Kulkarni, J. Higgins, R. P. Sharma, R. L. Greene, T. Venkatesan

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    226 Scopus citations

    Abstract

    Pulsed laser deposited films of Co-doped anatase TiO2 are examined for Co substitutionality, ferromagnetism, transport, magnetotransport, and optical properties. Our results show limited solubility (up to ∼2%) of Co in the as-grown films and formation of Co clusters thereafter. For the Ti0.93Co0.07O2-δ sample, which exhibits a Curie temperature (TC) over 1180 K, we find the presence of 20-50 nm Co clusters as well as a small concentration of CO incorporated into the remaining matrix. After being subjected to the hightemperature anneal during the first magnetization measurement, the very same sample shows a TC650 K and almost full matrix incorporation of Co. This TC is close to that of as-grown Ti0.99Co0.01O2-δ sample (∼700 K). The transport, magnetotransport, and optical studies also reveal interesting effects of the matrix incorporation of Co. These results are indicative of an intrinsic Ti1-xCoxO2-δ diluted magnetic semiconductor with TC of about 650-700 K.

    Original languageEnglish (US)
    Article number115211
    Pages (from-to)1152111-1152116
    Number of pages6
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume67
    Issue number11
    StatePublished - Mar 2003

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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