Soft-x-ray spectroscopic investigation of ferromagnetic Co-doped ZnO

The electronic properties of cobalt-doped ZnO were investigated through site-selective and element-sensitive x-ray-absorption spectroscopy in the vicinity of the Co L 2 , 3 edge, the oxygen K edge, and at the Zn L 3 edge. The spectroscopic measurements of the ferromagnetic cobalt-doped ZnO films app...

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Bibliographic Details
Published in:Journal of applied physics 2006-04, Vol.99 (8), p.08M111-08M111-3
Main Authors: Krishnamurthy, S., McGuinness, C., Dorneles, L. S., Venkatesan, M., Coey, J. M. D., Lunney, J. G., Patterson, C. H., Smith, K. E., Learmonth, T., Glans, P. -A., Schmitt, T., Guo, J. -H.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
ELECTRONIC-STRUCTURE
Fysik
MAGNETIC SEMICONDUCTORS
NATURAL SCIENCES
NATURVETENSKAP
Physics
TRANSITION-METAL OXIDES
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Summary:The electronic properties of cobalt-doped ZnO were investigated through site-selective and element-sensitive x-ray-absorption spectroscopy in the vicinity of the Co L 2 , 3 edge, the oxygen K edge, and at the Zn L 3 edge. The spectroscopic measurements of the ferromagnetic cobalt-doped ZnO films appear to have additional components in the O K edge x-ray-absorption spectrum not observed in the undoped films. The observed features may derive from both hybridization with unoccupied Co 3 d states and also from lattice defects such as oxygen vacancies. Only minor changes in the Zn L 3 edge spectra were observed. These observations are consistent with a polaron percolation model in which the ferromagnetic coupling is mediated by shallow donor electrons trapped in oxygen vacancies and couples the Co atoms substituted on Zn sites in the hexagonal wurtzite ZnO structure.
ISSN:0021-8979
1089-7550
1089-7550
DOI:10.1063/1.2165916