Magnetism and heterogeneity of Co in anatase Co:TiO2 magnetic semiconductor

Y.J. Lee, Machiel Pieter de Jong, R. Jansen

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    Using x-ray magnetic circular dichroism XMCD, x-ray absorption spectroscopy XAS, and energy filtered transmission electron microscopy, we provide evidence for a heterogeneous Co distribution in anatase Co:TiO2 magnetic semiconductor having a low Co concentration 1.4 at. %. Multiplet structure due to Co2+ is observed in XAS spectra, but suppressed due to the coexistence of metallic Co clusters and substitutional Co ions, whereas XMCD spectra resemble metallic Co. The presence of Co2+ can be correlated with earlier observations of impurity band conduction and Kondo behavior, whereas metallic Co clusters contribute to the ferromagnetism and anomalous Hall effect.
    Original languageUndefined
    Pages (from-to)0825061-0825063
    Number of pages3
    JournalApplied physics letters
    Issue number8
    Publication statusPublished - 2010


    • EWI-19222
    • METIS-276273
    • IR-75550

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