期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 322, 期 1, 页码 142-147出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2009.08.042
关键词
Nanocrystal; Chalcogenide; Spinel; Shape control; Magnetic property
资金
- NSF [ECS-0621850]
The magnetic properties of chalcogenide spinel CuCr2Se4 nanocrystals have been studied as a function of crystallite size (15-30 nm). A solution-based method is used for the facile synthesis of the nanocrystals with good size control. They have close to cubic morphology with a narrow size distribution and exhibit superparamagnetic behavior at room temperature. The Curie temperature and saturation magnetization of the nanocrystals are lower as compared with the bulk and decrease with decreasing nanocrystal size. A similar trend is observed in the paramagnetic state for the Curie-Weiss temperature and effective magnetic moment. The low temperature magnetization behavior can be qualitatively explained by spin glass dynamics. (C) 2009 Elsevier B.V. All rights reserved.
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