Soft-x-ray spectroscopic investigation of ferromagnetic Co-doped ZnO
2006 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 99, no 8, 08M111- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2006. Vol. 99, no 8, 08M111- p.
TRANSITION-METAL OXIDES, MAGNETIC SEMICONDUCTORS, ABSORPTION SPECTROSCOPY, ELECTRONIC-STRUCTURE, FILMS
IdentifiersURN: urn:nbn:se:kth:diva-37579DOI: 10.1063/1.2165916ISI: 000237404200520ScopusID: 2-s2.0-33646718737OAI: oai:DiVA.org:kth-37579DiVA: diva2:434386
QC 201108152011-08-152011-08-152011-08-15Bibliographically approved