LAUSR

Lightweight, broadband and high efficient microwave absorbing materials (MAMs) with tunable electromagnetic properties are highly demanding. However, the absorption properties are strangled by the simple loss mechanism in commonly-used absorbing materials. Here, we tested the microwave absorbing properties of Fe-NiS2/NiS/polyvinylidene fluoride (PVDF) in the frequency range of 2-18 GHz. For the 2.5% Fe-NiS2/NiS/PVDF with the filling content of 20 wt%, the maximum reflection loss can reach -61.72 dB at 14.88 GHz, and the bandwidth can reach 3.8 GHz with the reflection loss value below -10 dB. Loss mechanisms of different composites were analyzed on the basis of their magnetic and dielectric properties using both experimental and computational methods. The results indicate that the strong microwave absorption property is achieved through a balancing of dielectric loss and magnetic loss. These findings present a new strategy for the future design of MAMs.