Title:
|
Raman spectroscopy of Cu doping in Zn1-xCoxO diluted magnetic semiconductor |
Author:
|
L.H., Hoang; N.T.M., Hien; N.H., Hai; P., van Hai; N.T., Khoi; I.-S., Yang
|
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 firstorder
one in the Raman spectra, which is related to the carrier concentration, of the Cu-doped Zno.98Co0.02
O 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. |
URI:
|
http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7419
|
Date:
|
2009 |