Bimetallic Synergy Modulated Impedance Matching in SnSe-G Nanosheet Composites for Advanced Electromagnetic Wave Absorption

Exploring electromagnetic wave (EMW) absorbing materials with thin thickness, wide bandwidth, and strong attenuation characteristics to reduce electromagnetic pollution remains a critical challenge. This study constructs Fe–Co–SnSe/graphite nanosheet composites through solid-state reaction and ball milling processes, successfully anchoring magnetic nanoparticles onto graphite nanosheets. By rationally regulating the molar ratio of magnetic components, the FCS/G-1.5 composite delivers an RL min of −46.53 dB, corresponding to an EAB of 3.68 GHz at a thickness of merely 1.3 mm. Furthermore, a significant reduction in the radar cross-section (RCS) value during far-field simulations further verifies the practical applicability of the FCS/G- x composites. The outstanding electromagnetic properties of the as-prepared composites are mainly ascribed to the synergistic effect between dielectric loss and magnetic loss. This includes the cooperative contribution of multiple loss mechanisms, such as interfacial polarization, conduction loss, eddy current loss, as well as natural resonance and exchange resonance. This study fills the gap in the progress of SnSe-based absorbing materials and provides a reliable pathway for designing the next generation of lightweight and efficient EMW absorbing devices.