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Advances in Condensed Matter Physics
Volume 2013 (2013), Article ID 424398, 6 pages
http://dx.doi.org/10.1155/2013/424398
Research Article

Oxygen Defects Mediated Magnetism of Ni Doped ZnO

1Shanghai University of Electric Power, 2588 Pingyang Road, Shanghai 200090, China
2East China Normal University, 500 Dongchuan Road, Shanghai 200241, China

Received 23 July 2013; Revised 2 September 2013; Accepted 16 September 2013

Academic Editor: Xuan Luo

Copyright © 2013 W. J. Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ni doped ZnO nanoparticles were synthesized by a solution route and annealed in O2, air, and Ar, respectively. X-ray diffraction and X-ray photoelectron spectroscopy measurements show that the samples possess typical wurtzite structure and have no other impurity phases. Magnetization loops for ZnO samples were measured and clearly show typical ferromagnetic saturation behavior. With the defect analysis based on photoluminescence spectroscopy, the effect of defects on the nature and origin of ferromagnetism was investigated. The results suggest that oxygen vacancies, especially single ionized oxygen vacancies, play a crucial role in mediating ferromagnetism in the Ni doped ZnO.