CoFe2O4/Fe magnetic nanocomposite: Exchange coupling behavior and microwave absorbing property
CoFe2O4/Fe magnetic nanocomposite: Exchange coupling behavior and microwave absorbing property
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DOI：
10.1016/j.ceramint.2020.04.099
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发表时间：
2020-08-01
影响因子：
5.2
通讯作者：
Abkenar, S. Khabbaz
中科院分区：
文献类型：
--
作者：
Mahdikhah, V;Ataie, A.;Abkenar, S. Khabbaz
In this research, a CoFe2O4/Fe magnetic nanocomposite was successfully produced through mechanical alloying. The effects of different Fe concentrations (10, 30, and 50 wt %) and milling time (1, 3, 5, and 10 h) on the characteristics of the nanocomposite samples were systematically investigated. Single-phase CoFe2O4 nanoparticles were produced with a mean particle size of 60 nm and a saturation magnetization of 76 emu/g. The FESEM and HRTEM images confirm the heterostructure and particle size reduction of the CoFe2O4/30 wt% Fe nanocomposite after milling for 5 h. Also, the STEM-EDX signals of this nanocomposite sample revealed a uniform elemental distribution after 5 h of milling. The single-phase-like hysteresis loop and switching field distribution curves of 3-h milled nanocomposites containing 10 and 30 wt% Fe, revealed exchange coupling in the nanocomposite samples. This result was confirmed by simultaneous enhancements of the maximum energy product (BH)(max) and the remnant magnetization/saturation magnetization ratio (M-r/M-s). The (BH)(max) value of the CoFe2O4/10 wt% Fe nanocomposite after 3 h milling was 2.7 MGOe, which was about 1.8 times higher than that of single-phase CoFe2O4 nanoparticles. An epoxy-based nanocomposite fabricated with CoFe2O4 /Fe segments exhibited magnetic losses in the X-band frequency range. The maximum reflection loss (- 27 dB at 11.2 GHz frequency) for the CoFe2O4/30 wt% Fe nanocomposite milled for 10 h was 8 times greater than that of pureCoFe(2)O(4) nanoparticles.
