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Magnetic and Mössbauer spectroscopy studies of CoFe2O4/CoFe2 nanocomposites

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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 Mössbauer 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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Acknowledgments

This work was funded by the National Natural Science Foundation of China (No. 11504132), and the Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province (JJKH20180768KJ).

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Authors and Affiliations

  1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping, 136000, China

    Li Wang, Chaoqun Yang, Yue Hu, Ji Li, Shichong Xu & Haibo Li

  2. National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping, 136000, China

    Li Wang & Hongjun Jin

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  1. Li Wang
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  2. Chaoqun Yang
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Correspondence to Haibo Li.

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Wang, L., Yang, C., Jin, H. et al. Magnetic and Mössbauer spectroscopy studies of CoFe2O4/CoFe2 nanocomposites. J Mater Sci: Mater Electron 31, 13469–13476 (2020). https://doi.org/10.1007/s10854-020-03901-x

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