Enhanced microwave absorption of multiferroic Co(2)Z hexaferrite-BaTiO3 composites with tunable impedance matching

摘要

The microwave absorbing properties of multiferroic particulate composites consisting of Co(2)Z hexaferrite and BaTiO3 (BT) were investigated over a frequency range of 2-18 GHz. The effective complex permeability and permittivity of Co(2)Z-BT composites are shown to be effectively manipulated by varying the weight ratio of the two phases, which consequently demonstrates a strong tunability in the optimal working frequency and minimum reflection loss (RL). For the optimal Co(2)Z-10BT composite, the RL peak at a thickness of 2.0 mm was enhanced by 97.8% in comparison with that of the single phase Co(2)Z hexaferrite. Moreover, the impedance-matched RL characteristics below 10 GHz show a substantial improvement in both thickness and bandwidth with increasing BT content. This work clearly shows the potential to tune the impedance matching and microwave absorption performances of multiferroic composites. (C) 2015 Elsevier B.V. All rights reserved.