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

Y.J. Lee; M.P. de Jong; R. Jansen

doi:10.1063/1.3327805

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

Y.J. Lee
, M.P. de Jong
, R. Jansen

Research output: Contribution to journal › Article › Academic › peer-review

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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.

Original language	English
Article number	082506
Number of pages	3
Journal	Applied physics letters
Volume	96
Issue number	8
DOIs	https://doi.org/10.1063/1.3327805
Publication status	Published - 2010

Keywords

2024 OA procedure

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10.1063/1.3327805

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Cite this

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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.",

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T1 - Magnetism and heterogeneity of Co in anatase Co:TiO2 magnetic semiconductor

AU - Lee, Y.J.

AU - de Jong, M.P.

AU - Jansen, R.

PY - 2010

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N2 - 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.

AB - 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.

KW - 2024 OA procedure

U2 - 10.1063/1.3327805

DO - 10.1063/1.3327805

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JO - Applied physics letters

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