Magnetic/carbon　composites　hold　tremendous　potential　for　optimizing　impedance　matching　and　enhancing　electromagnetic　wave　(EMW)　attenuation　capabilities.　However,　significant　challenges　still　exist　in　regulating　the　heterogeneous　interfaces　between　the　magnetic　and　carbon　components.　In　this　study,　organometallic　precursor　polymers　were　prepared　using　the　organic　metal　compound　iron　acrylate　as　the　core　unit.　The　movement　and　migratory　capacity　of　the　magnetic　medium　were　optimized　by　adjusting　the　components　of　the　organometallic　precursor　polymers,　thereby　enabling　the　control　of　the　magnetic/carbon　heterogeneous　interfaces.　Ultimately,　the　nitrogen-doped　C/Fe3O4/Fe　composites　with　a　network　structure　(N-C/Fe3O4/Fe-n)　exhibited　superior　EMW　absorption,　achieving　a　minimum　reflection　loss　(RLmin)　of　−43.93　dB　at　17.36　GHz,　along　with　an　extraordinarily　wide　effective　absorption　bandwidth　(EAB)　of　5.9　GHz　(ranging　from　11.86　to　17.76　GHz)　at　a　thickness　of　2.5　mm,　and　a　simulated　radar　cross-section　reduction　value　of　13.78　dBm2.　The　outstanding　EMW　absorption　can　be　attributed　to　the　presence　of　abundant　heterogeneous　interfaces,　optimized　impedance　matching,　heteroatom　doping,　and　strong　magnetic　loss.　This　research　offers　a　novel　approach　for　regulating　heterogeneous　interfaces　in　magnetic/carbon　composites.　©　2025　Elsevier　B.V.