Enhanced microwave absorption of BaTiO_3-based ferroelectric/ferromagnetic nanocomposite

摘要

Morphology, crystal structure, magnetic and microwave absorption properties of BaTiO-3-based ferromagnetic/ferroelectric composites were investigated in this research. It was evident that Ni—Co—P/BaTiO_3 composite was a narrowband absorber, whereas carbonyl iron/BaTiO_3 composite samples showed broadband absorption characteristics. For the carbonyl iron/BaTiO_3 composite, a reflection loss exceeding -20 dB was obtained in the frequency range of 3.8-5.8 GHz with an absorber thickness of 2.3-3.3 mm. An optimal RL of -46 dB was found at 4.7 GHz for an absorber thickness of 2.8 mm. The effective absorption bandwidth with RL< -10dB was extended and reached 16GHz (2-18 GHz). Moreover, the intrinsic reasons for microwave absorption of the composites, the dielectric loss and magnetic loss mechanics were also investigated.