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

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Lee, Y.J. and Jong de, M.P. and Jansen, R. (2010) Magnetism and heterogeneity of Co in anatase Co:TiO2 magnetic semiconductor. Applied Physics Letters, 96 (8). 082506. ISSN 0003-6951

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Abstract: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.
Item Type:Article
Copyright:© 2010 American Institute of Physics
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Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/75550
Official URL:http://dx.doi.org/10.1063/1.3327805
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