Recent advances of magnetism-based microwave absorbing composites: an insight from perspective of typical morphologies

Due to the fast development of various wireless devices and radar detection technology, the microwave absorbing composites have been developed to solve the problem of electromagnetic pollution and radar stealth by transferring microwave energy into thermal energy. Given that, the morphology is a key factor which can influence the absorbing performance of absorbers to a large extent. Recently, abundant investigations on fabrication of microwave absorbers with miraculous morphologies and microstructures have been reported. This review aims at summarizing the recent progress of magnetism-based microwave absorbing composites from perspective of several typical morphologies, including core-shell structure, layered structure, porous structure, polyhedral structure, flower-like structure and coral/needle-like structure etc. Firstly, the influential factors of electromagnetic absorption ability in materials and their relationship with morphology have been introduced briefly, then the synthesis methods, microwave absorption properties, and electromagnetic absorbing mechanisms of these composites in each morphology are discussed in detail. Moreover, the promising prospects of magnetism-based microwave absorbing composites with different morphologies are also proposed.