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Constructing multi-interfaces is an effective strategy for realizing “thin, wide, strong and stable” microwave absorber. In this work, FeNi/Fe2O3@Al2O3@C nanocomposites have been prepared and their microstructure is that FeNi nanoparticles with diameter of ~ 20 nm and Fe2O3 nanoparticles with size of ~ 5 nm are dispersed in Al2O3 micron scale rod covered by carbon layer, in which multi-interfaces of FeNi-Al2O3, FeNi-Fe2O3, Fe2O3-Al2O3 and Al2O3-C are constructed. Proper impedance matching, quarter-wavelength interference cancellation and integrated electromagnetic loss capacity can be realized through the optimization of electromagnetic parameters accompanied with multi-interfaces structure, resulting in the good microwave absorption behaviors with merits of “broad, strong, thin and stable”. The nanocomposites have -49.6 dB of minimal reflection loss (RLm) at 3.2 mm 5.44 GHz (12.56-18 GHz) of effective absorption bandwidth (EBA) at 2.1 mm and RLm exceeding -10 dB at 1.6-10 mm and -20 dB at 1.8-10 mm. These results demonstrate that constructing multi-interfaces is a guiding role for obtaining superior microwave absorber.

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