Abstract
CoFe2O4/CoFe2 nanocomposites with exchange coupling behavior have been obtained from a two-step process. First, CoFe2O4 nanoparticles with size of 11 nm were synthesized using a co-precipitation method. And second, the as-synthesized CoFe2O4 nanoparticles were reduced under mixed gas (Ar 95% + H2 5%) for 1 h at different temperatures. The structure, phase, particle size, morphology, and magnetic properties with the reduction temperature were studied. X-ray diffraction and Mossbauer spectroscopy results show the whole process from pure CoFe2O4 hard magnetic phase to pure CoFe2 soft magnetic phase when the reduction temperature increases from 400 to 700 °C, and CoFe2O4/CoFe2 hard/soft nanocomposites are obtained at 500 and 600 °C. Magnetic measurement result show there is a stronger exchange coupling interaction between CoFe2O4 and CoFe2 for the sample reduced at 500 °C, but not in the sample reduced at 600 °C. A giant 76% enhancement of the maximum magnetic energy product (BH)max compared with pure CoFe2O4 will be of technological significance in the future.
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