Controlled self-assembled FeNi alloy/graphene foam composite for lightweight and broadband microwave absorption

FeNi alloy/graphene foam (FNGF) is synthesized via one-step hydrothermal method. At 5 wt% loading, sample 1# covers Ku-band (11.76–18 GHz, 2.09 mm); sample 3# achieves −63.76 dB at 15.68 GHz.