Investigation and optimization of Fe/ZnFeO as a Wide-band electromagnetic absorber.

In this research, a facile in-situ growth method was applied to load ZnFeO nanoparticles on carbonyl iron (Fe) flakes. These loaded ZnFeO exhibited cone shape with an average size of ∼200 nm. The results revealed that the frequency region with reflection loss <-10 dB (f) was up to 6.2 GHz (d = 1.5 mm), suggesting excellent wideband electromagnetic absorption (EM) properties. The electromagnetic absorption mechanism was discussed in depth which attributed to the synergetic effect of Fe and ZnFeO. The loaded ZnFeO played a key role on suppressing inverse electromagnetic radiation, eddy effect, simultaneous maintaining moderate magnetic loss ability. Besides, the formed interface of ZnFeO/Fe could induce interface polarization relaxation effect at external electromagnetic field, which greatly boosted the effective dielectric loss ability (ε''). Meanwhile, the interface polarization intensity was controllable by tuning the weight ratio of Fe.