Article ID Journal Published Year Pages File Type
5459560 Journal of Alloys and Compounds 2017 13 Pages PDF
Abstract
Magnetically exchange coupled CoFe2O4/CoFe2 composite particles were synthesized through spray pyrolysis, followed by H2 reduction. The H2 concentration was controlled to be 5, 8 and 10 vol%, respectively, in three parallel experiments. The products show a core/shell structure, with CoFe2O4 as the core, and CoFe2 as the shell. The structure is confirmed by TEM-EDX and STEM analysis. The XRD patterns indicate the existence of both CoFe2O4 and CoFe2 phases in the composites. The magnetic hysteresis loop of CoFe2O4/CoFe2 composite particles reduced by 5 vol% H2 is smooth and kink-free, indicating an effective exchange coupling between CoFe2O4 and CoFe2. Henkel Plots are further used to investigate the magnetic exchange coupling in the composites. This paper presented a convenient, environmentally friendly and effective method to synthetize magnetically exchange coupled composite particles.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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