Please use this identifier to cite or link to this item:
|Title:||Effects of rapid thermal annealing on structural, magnetic and optical properties of Ni-doped ZnO thin films|
Ni-doped ZnO thin film
|Citation:||Zhao, X., Liu, E., Ramanujan, R.V., Chen, J. (2012-05). Effects of rapid thermal annealing on structural, magnetic and optical properties of Ni-doped ZnO thin films. Current Applied Physics 12 (3) : 834-840. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cap.2011.11.016|
|Abstract:||XPS depth profiles were used to investigate the effects of rapid thermal annealing under varying conditions on the structural, magnetic and optical properties of Ni-doped ZnO thin films. Oxidization of metallic Ni from its metallic state to two-valence oxidation state occurred in the film annealed in air at 600°C, while reduction of Ni 2+ from its two-valence oxidation state to metallic state occurred in the film annealed in Ar at 600 and 800°C. In addition, there appeared to be significant diffusion of Ni from the bottom to the top surface of the film during annealing in Ar at 800°C. Both as-deposited and annealed thin films displayed obvious room temperature ferromagnetism (RTFM) which was from metallic Ni, Ni 2+ or both with two distinct mechanisms. Furthermore, a significant improvement in saturation magnetization (M s) in the films was observed after annealing in air (M s = 0.036 μ B/Ni) or Ar (M s = 0.033 μ B/Ni) at 600°C compared to that in as-deposited film (M s = 0.017 μ B/Ni). An even higher M s value was observed in the film annealed in Ar at 800°C (M s = 0.055 μ B/Ni) compared to that at 600°C mainly due to the diffusion of Ni. The ultraviolet emission of the Ni-doped ZnO thin film was restored during annealing in Ar at 800°C, which was also attributed to the diffusion of Ni. © 2011 Elsevier B.V. All rights reserved.|
|Source Title:||Current Applied Physics|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 12, 2018
WEB OF SCIENCETM
checked on Jun 5, 2018
checked on Jul 6, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.