Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 567, Issue -, Pages 73-76Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.03.078
Keywords
Composite materials; Nano-structured materials; Magentization; Magnetic measurements
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Funding
- Chinese National Foundation of Natural Science [51172166, 51202078, 11205116]
- Fundamental Research Funds for the Central Universities [111042]
- Wuhan University [2012202020203]
- Huazhong University of Science and Technology [01-18-185011]
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CoFe2O4/CoFe2 composite nano-particles were synthesized by heating CoFe2O4 nano-particles in reducing atmosphere at 300 degrees C and 400 degrees C. Their composition, microstructure and magnetic properties were investigated. It was found that the product of reducing CoFe2O4 at 300 degrees C iscomposed by CoFe2O4 nano-particles and a small amount of CoFe2 nano-alloy. Based on the negative values of Henkel plots and the two-phase behavior in magnetic hysteresis loop the dominant inter-particle dipole coupling was confirmed. But in the process of reducing CoFe2O4 at 400 degrees C, surface layers of CoFe2 were formed on the CoFe2O4 nano-particles, and exchange coupling appeared at the interface of both phases, which was confirmed from the positive values of Henkel plots. (C) 2013 Elsevier B. V. All rights reserved.
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