Enhanced microwave absorption properties of (1−x)CoFe2O4/xCoFe composites at multiple frequency bands

Abstract (1−x)CoFe2O4/xCoFe composites with x = 0.3, 0.4, 0.5, 0.6 were synthesized by using a hydrothermal method. The face-centered cubic structure CoFe2O4 adheres to the polyhedral CoFe surface due to strong magnetic interaction to form a composite material. The effects of compositions of the CoFe2O4/CoFe composites on their microwave absorption properties were studied. The sample with a composition of 0.4CoFe2O4/0.6Co4Fe6 showed optimal reflection loss (RL) −58.22 dB at 12.96 GHz, and the matching thickness was 1.45 mm. Meanwhile, it had an effective absorption frequency range of 11.12–15.28 GHz (RL