Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 320, Issue 6, Pages 1102-1105Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2007.10.022
Keywords
ferromagnetism; Ni doping; cluster; diluted magnetic semiconductor; spintronics
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Ni-doped ZnO samples with ferromagnetism at room temperature have been prepared by solid state reaction. It is found that the ferromagnetism originates from the nanosized Ni clusters formed from the decomposition of NiO during calcination. The magnetic properties can be explained by the microstructure of sparsely distributed, randomly oriented and magnetically saturated Ni clusters. Experiments show that the addition of Cu ions will block the decomposition of NiO because Cu2+ is more likely reduced to Cu+. Hall effect confirms the absence of exchange coupling between local spins and charge carriers. (C) 2007 Elsevier B. V. All rights reserved.
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