▎ 摘　　要

Simple and efficient preparation high-performance magnetic carbon-based nanocomposites as electromagnetic wave-absorbing materials is a research hotspot. Here, employing a straightforward, ecologically friendly, and effective solid-state technique, FeCo/graphene nanocomposites with good electro-magnetic wave absorption capabilities were successfully fabricated without the use of any external carbon sources. m-NaCl powder is combined with Co(acac)2 and Fe(acac)3 and then annealed at a particular temperature. During the annealing process, FeCo nanoparticles were synthesized and supported on graphene nanocomposites. Following annealing at 700 degrees C, the material showed an ideal reflection loss of -71.63 dB at 10.8 GHz, an effective bandwidth of 4.24 GHz, and a thickness of 2.68 mm. The radar cross section (RCS) of FeCo/C-700 is less than -10 dB m2, which provides evidence that the samples have good radar wave attenuation capabilities when the scattering angle is between 0 and 60 degrees. The approach for creating graphene composites with FeCo nanoparticles suggested in this study serves as a crucial source of inspiration for the later development of new magnetic carbon nanocomposite systems.