Composition dependence of the magnetic properties of CoFe2O4/CoFe2 composite nano-ceramics

CoFe2O4/CoFe2 composite nano-ceramics with varying composition ratios were synthesized using a reduction reaction and spark plasma sintering. The compositions and particle sizes of the ceramics were then characterized using X-ray diffraction, and the mass ratios were quantitatively determined via th...

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Bibliographic Details
Published in:Ceramics international 2015-04, Vol.41 (3), p.3896-3900
Main Authors: Ou-Yang, Jun, Zhang, Yue, Luo, Xiaoning, Yan, Baiqian, Zhu, Benpeng, Yang, Xiaofei, Chen, Shi
Format: Article
Language:English
Subjects:
A: Sintering
B: Composites
C: Magnetic properties
Ceramics
D: Ferrites
Exchange
Information technology
Joining
Magnetic properties
Nanoparticles
Nanostructure
Phases
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Summary:CoFe2O4/CoFe2 composite nano-ceramics with varying composition ratios were synthesized using a reduction reaction and spark plasma sintering. The compositions and particle sizes of the ceramics were then characterized using X-ray diffraction, and the mass ratios were quantitatively determined via thermal-gravity analysis. The magnetic property characteristics indicate that the coercivity decreased significantly with an increase in the soft-magnetic CoFe2 content, while the saturation magnetization drastically increased. In addition, a characterization of the Henkel plots showed a clear enhancement of the inter-phase exchange coupling when the number of soft-magnetic CoFe2 nano-particles was increased. Enhanced exchange coupling at the interface between the soft-magnetic and the hard-magnetic phases is critical for the occurrence of exchange-spring behavior, which has potential applications in the field of information technology.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2014.11.071