Multi-interfacial 1D magnetic ferrite@C fibers for broadband microwave absorption

As a classical magnetic material, spinel ferrite materials have been widely studied in the field of microwave absorption. However, due to their low conductivity and uncontrollable self-aggregation, their practical application has been greatly constrained. Now, a novel multi-interfacial one-dimensional (1D) magnetic ferrite@C fibers composites were synthesized by a facile electrospinning and annealing process. Through effective structural design and component adjustment, Zn-based ferrites were successfully confined into 1D carbon fibers. This structure brings about a large number of heterogeneous interfaces, while avoiding magnetic aggregation. Impressively, the results indicate that as-prepared ferrite@C fibers exhibit excellent EM absorption properties. The minimum reflection loss can reach up to −47.42 dB at 13.52 GHz with a matching thickness of 2.5 mm. In the meantime, a super-wide effective absorption bandwidth of 9.28 GHz (8.24–17.52 GHz) is obtained at 3.3 mm, which almost concurrently achieves coverage for X and Ku-bands. This study provides a feasible path to design novel and efficient magnetic ferrite/dielectric absorbers.