Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 515, Issue -, Pages 12-15Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.11.103
Keywords
Dilute magnetic semiconductors; X-ray photoelectron spectroscopy; Magnetic properties
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Influence of Cr doping (5%) in ZnO lattice has been investigated in terms of modifications in electronic properties, evolution of defects and exploring their possible relationship with magnetic properties, using SQUID magnetometry and X-ray photoelectron spectroscopy (XPS). The Cr doping drives the diamagnetic ZnO host to a paramagnetic state, however, its post annealing in vacuum induces room temperature ferromagnetism (RTFM) in it that disappears by re-heating it in air. The findings infer a reversible ferromagnetic ordering in the Cr doped ZnO matrix. The XPS results indicate trivalent state of the Cr ions in the as-synthesized sample which tend to reduce to bivalency upon its vacuum annealing and also the evolution of oxygen vacancy defects have clearly been observed. The results indicate a close relationship of oxygen vacancies with the induced ferromagnetism. (C) 2011 Elsevier B. V. All rights reserved.
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