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Raman spectroscopy of Cu doping in Zn1-xCoxO diluted magnetic semiconductor

Title
Raman spectroscopy of Cu doping in Zn1-xCoxO diluted magnetic semiconductor
Authors
Hoang L.H.Hien N.T.M.Hai N.H.van Hai P.Khoi N.T.Yang I.-S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2009
Journal Title
Journal of Raman Spectroscopy
ISSN
0377-0486JCR Link
Citation
vol. 40, no. 11, pp. 1535 - 1538
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The room-temperature ferromagnetism and the Raman spectroscopy of the Cu-doped Zn1-xCoxO powders prepared by the sol-gel method are reported. The x-ray diffraction (XRD) data confirmed that the wurtzite structure of ZnO is maintained for ZnO doped with Co below 10 at%. The magnetization-field curves measured at room temperature demonstrated that all Co-doped ZnO powders were paramagnetic.Ferromagnetic ordering is observed for the samples doped with Cuin Zno.98Co0.02O and strongly depends on the concentration of Cu. The relative strength of the second-order LO peak to the first-order one in the Raman spectra, which is related to the carrier concentration, of the Cu-doped Zno.98Co0.02O powder is strongly correlated with the saturation magnetic moment of the system. This seems to be in favor of the Ruderman-Kittel-Kasuya-Yosida (RKKY) or double exchange mechanism of the ferromagnetism in this system. © 2009 John Wiley & Sons, Ltd.
DOI
10.1002/jrs.2295
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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