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

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. and Guo, J. -H. (2006). Soft-x-ray spectroscopic investigation of ferromagnetic Co-doped ZnO. Journal of Applied Physics, 99(8), article no. 08M111.

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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 L2,3 edge, the oxygen K edge, and at the Zn L3 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 3d states and also from lattice defects such as oxygen vacancies. Only minor changes in the Zn L3 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.

Item Type: Journal Item
Copyright Holders: 2006 American Institute of Physics
ISSN: 0021-8979
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetTrinity College IAMS PRTLI program
Not SetNot SetScience Foundation Ireland
Not SetNot SetEnterprise Ireland through the International Collaboration Travel Fund
Extra Information: This issue: Proceedings of the 50th Annual Conference on Magnetism and Magnetic Materials
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 35398
Depositing User: Satheesh Krishnamurthy
Date Deposited: 25 Apr 2013 10:25
Last Modified: 07 Dec 2018 10:10
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