Magnetically tunable metamaterial absorbers based on two layers ferrite-ferrite structure with different ferromagnetic resonant line widths

Magnetically tunable metamaterial absorbers based on two layers ferrite-ferrite with different ferromagnetic resonance line widths have been proposed in this paper. The metamaterial absorber is composed of a metallic background plane, two layers ferrite-ferrite substrate and metallic SRRs. The ferromagnetic resonance generated in the metamaterial absorber under the action of a bias magnetic field, the absorption reaches the maximum at the ferromagnetic resonance frequency. The frequency increases from 2.72 GHz to 7.42 GHz with the increasing of the applied magnetic field from 1000 Oe to 2000 Oe. A good agreement between simulated results and the predicted results has been achieved. Our results pave a path towards design of tunable devices in unintended radiations suppression applications.