Achieving excellent metallic magnet-based absorbents by regulating the eddy current effect

We present the results that a suitable eddy current effect could act as an effective microwave dissipative mechanism for metallic magnet-based electromagnetic wave absorbents. With no need to introduce low or nonconductive components, the strongest absorption of −43.2 dB at 14.7 GHz could be achieved with a thin absorbent layer of 1.1 mm and at the mass fraction of the nickel fibers filler in the composite of 40 wt. %. This work utilizes the intrinsic dependence of electromagnetic wave dissipation on the eddy current effect and opens a simple and feasible way for designing of microwave absorption materials and composites.We present the results that a suitable eddy current effect could act as an effective microwave dissipative mechanism for metallic magnet-based electromagnetic wave absorbents. With no need to introduce low or nonconductive components, the strongest absorption of −43.2 dB at 14.7 GHz could be achieved with a thin absorbent layer of 1.1 mm and at the mass fraction of the nickel fibers filler in the composite of 40 wt. %. This work utilizes the intrinsic dependence of electromagnetic wave dissipation on the eddy current effect and opens a simple and feasible way for designing of microwave absorption materials and composites.