Tuning layer thickness and layer arrangement in a GdMnO₃ and GdMnO₃-MoSe₂ bi-layer absorber to cover the S, C, and X band frequency range

The bi-layer absorber's microwave absorption performance can be enhanced by adjusting and manipulating the layers' composition, layer thickness, and layer arrangement. Herein, two magnetic and magneto-electric components, GdMnO₃ (G) and GdMnO₃-50 wt.% MoSe₂ (GM), were prepared via a solvothermal method. In particular, the impact of filler loading and layer thickness on microwave absorption characteristics was examined. The findings indicate that a single-layer absorber sample containing G or GM components independently did not have good microwave absorption capability. On the other hand, a bi-layer absorber sample with G as the matching layer (1.5 mm thickness) and GM as the absorber (0.5 mm thickness) possesses exceptional -44 dB reflection loss with 9 GHz of effective absorption bandwidth, which covers S, C, and almost the whole X band frequency range. The optimal 3D network architecture of the G particles' rod-like morphology, which improves the impedance matching property, may be to blame for this phenomenon. Additionally, this special 3D network architecture gives an abundance of interfaces to disperse electromagnetic waves in addition to many channels for microwave reflecting and scattering. More crucially, the composites' microwave absorption mechanism is investigated and studied, which offers a trustworthy guide for making a bi-layer absorber.