Tunable Electromagnetic and Microwave Absorption Properties of Ba3Co2Fe24O41/P(VDF-TrFE) Composites

The electromagnetic and microwave absorption properties of polymer-based Ba ₃ Co ₂ Fe ₂₄ O ₄₁ /P(VDF-TrFE) composites were investigated. The effective complex permeability and permittivity of the two-phase composites can be manipulated by either varying the Ba ₃ Co ₂ Fe ₂₄ O ₄₁ content or applying the dc magnetic field (H _dc ). The composite containing 90 wt% Co ₂ Z obtains a maximum reflection loss (RL) due to a proper impedance match and relatively high magnetic loss. In addition, it is found that the position of RL peak was tuned from 5.5 to 7 GHz with H _dc up to 50 mT, whereas the intensity obtains a remarkable enhancement of 67% at 15 mT. These results reveal great potential for the applications of ferroelectric-ferromagnetic composites with tunable microwave absorption.