Mesoscopically ordered Fe₃O₄/C nano-composite for superior broadband electromagnetic wave absorption

Due to the seriousness of the electromagnetic pollution, it is urgent to develop high-efficiency broadband electromagnetic wave absorption (EMA) materials. As a traditional EMA material, the question of expanding absorption bandwidth for Fe₃O₄/C composite need to be addressed. Based on this consideration, rationally designed Fe₃O₄/C nano-composite with the regular mesoscopic (1–100 nm) arrangement structure has practical significance. Benefited from this unique structure, the obtained Fe₃O₄/C mesoscopic ordered nano-composite exhibits broadband absorbing characteristics in 2–12 GHz. The effective absorption bandwidth value of the material is 6.40 GHz at low frequency (covered C band) and the minimum reflection loss is −50.47 dB. The superior broadband is derived from the good whole-test-frequency impedance matching and the strong low-frequency magnetic loss, which is achieved by the regularly mesoscopic arrangement of the magnetic nanoparticles. This study will provide certain inspirations and guidance for the design of low frequency broadband EMA materials in the future.