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

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

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

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 languageUndefined
Pages (from-to)0825061-0825063
Number of pages3
JournalApplied physics letters
Volume96
Issue number8
DOIs
Publication statusPublished - 2010

Keywords

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

Cite this

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title = "Magnetism and heterogeneity of Co in anatase Co:TiO2 magnetic semiconductor",
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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author = "Y.J. Lee and {de Jong}, {Machiel Pieter} and R. Jansen",
note = "10.1063/1.3327805",
year = "2010",
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journal = "Applied physics letters",
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Magnetism and heterogeneity of Co in anatase Co:TiO2 magnetic semiconductor. / Lee, Y.J.; de Jong, Machiel Pieter; Jansen, R.

In: Applied physics letters, Vol. 96, No. 8, 2010, p. 0825061-0825063.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

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

AU - Lee, Y.J.

AU - de Jong, Machiel Pieter

AU - Jansen, R.

N1 - 10.1063/1.3327805

PY - 2010

Y1 - 2010

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 - EWI-19222

KW - METIS-276273

KW - IR-75550

U2 - 10.1063/1.3327805

DO - 10.1063/1.3327805

M3 - Article

VL - 96

SP - 825061

EP - 825063

JO - Applied physics letters

JF - Applied physics letters

SN - 0003-6951

IS - 8

ER -