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

Krishnamurthy, S; McGuinness, C; Dorneles, LS; Venkatesan, M; Coey, JMD; Lunney, JG; Pattersonb, CH; Smith, KE; Learmonth, T and Glans, PA, et al. (2006) In Applied Physics Reviews 99(8).
Abstract
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,L-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 3d 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... (More)
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,L-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 3d 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. (C) 2006 American Institute of Physics. (Less)
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Applied Physics Reviews
volume
99
issue
8
publisher
American Institute of Physics
external identifiers
  • wos:000237404200520
  • scopus:33646718737
ISSN
0021-8979
DOI
10.1063/1.2165916
language
English
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yes
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e69901b4-a24c-441b-9092-57ba148ebd2e (old id 409505)
date added to LUP
2007-10-08 08:25:08
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2019-03-19 01:45:55
@article{e69901b4-a24c-441b-9092-57ba148ebd2e,
  abstract     = {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,L-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 3d 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. (C) 2006 American Institute of Physics.},
  author       = {Krishnamurthy, S and McGuinness, C and Dorneles, LS and Venkatesan, M and Coey, JMD and Lunney, JG and Pattersonb, CH and Smith, KE and Learmonth, T and Glans, PA and Schmitt, Thorsten and Guo, JH},
  issn         = {0021-8979},
  language     = {eng},
  number       = {8},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Reviews},
  title        = {Soft-x-ray spectroscopic investigation of ferromagnetic Co-doped ZnO},
  url          = {http://dx.doi.org/10.1063/1.2165916},
  volume       = {99},
  year         = {2006},
}