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Rational excogitation of microstructure and chemical constituents is a superior means of constructing electromagnetic wave (EMW) absorption materials with high performance. In this study, a kind of honeycomb-like NiFe2O4@Ni@C composite is prepared via an uncomplicated polymerization, pyrolysis and etching. Porous structure and internal cavity of NiFe2O4@Ni@C contribute to the numerous reflection and scattering of EMW. The strong ferromagnetic resonance of NiFe2O4 core and the multiple relaxation processes of porous carbon shell strongly