Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 1, Pages 142-147Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2009.08.042
Keywords
Nanocrystal; Chalcogenide; Spinel; Shape control; Magnetic property
Funding
- NSF [ECS-0621850]
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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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