Effects of annealing on the ferromagnetism and photoluminescence of Cu-doped ZnO nanowires
- Xu, H. J.
- Zhu, H. C.
- Shan, X. D.
- Liu, Y. X.
- Gao, J. Y.
- Zhang, X. Z.
- Zhang, J. M.
- Wang, P. W.
- Hou, Y. M.
- Yu, D. P.
DOIAbstract
Room temperature ferromagnetic Cu-doped ZnO nanowires have been synthesized using the chemical vapor deposition method. By combining structural characterizations and comparative annealing experiments, it has been found that both extrinsic (CuO nanoparticles) and intrinsic (Zn1-xCuxO nanowires) sources are responsible for the observed ferromagnetic ordering of the as-grown samples. As regards the former, annealing in Zn vapor led to a dramatic decrease of the ferromagnetism. For the latter, a reversible switching of the ferromagnetism was observed with sequential annealings in Zn vapor and oxygen ambience respectively, which agreed well with previous reports for Cu-doped ZnO films. In addition, we have for the first time observed low tempera...
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