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

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

doi:10.1063/1.3327805

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

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

Research output: Contribution to journal › Article › Academic › peer-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 language	Undefined
Pages (from-to)	0825061-0825063
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

EWI-19222
METIS-276273
IR-75550

Access to Document

10.1063/1.3327805

http://eprints.eemcs.utwente.nl/secure2/19222/01/Magnetism_and_heterogeneity_of_Co_in_anatase_CoTiO2_magnetic_semiconductor.pdf

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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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

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ER -