Abstract
Exchange coupling magnetic composites have been proven to help improve the microwave absorption performance of absorbents. However, composite systems reported showed unsatisfactory exchange coupling effect due to poor particle dispersion and interface contact. Herein, exchange-coupled CoFe2O4/CoFe composites were prepared by in-situ hydrothermal reduction. The influence of surfactant on the microstructure and properties were studied in detail. The results showed that the CoFe2O4/CoFe samples with hexadecyltrimethylammonium bromide (CTAB) as the surfactant had more two-phase interfaces and excellent dispersion, the grain size of CoFe2O4 and CoFe were 45 nm and 38.4 nm. Close contact interface and small grain size caused suitable exchange coupling effect, which enhanced the microwave absorption performance of CoFe2O4/CoFe composites. The CoFe2O4/CoFe sample displayed maximum reflection loss (RLmax) of −54.8 dB at 3.5 mm thickness and effective absorption bandwidth (EAB) of 3.16 GHz, revealing promising prospect in the electromagnetic wave absorption field.
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