Magnetism and microwave absorption properties of two-dimensional layered ferromagnetic metal Fe3GeTe2

Two-dimensional van der Waals (vdW) ferromagnetic materials have attached a significant attention for developing miniaturized electronic devices. Fe3GeTe2 (FGT) as two-dimensional vdW materials with intrinsic ferromagnetism has high Curie temperature, which have potential applications in overcoming microwave pollution and radiation. Herein, a single-crystal FGT is synthesized using a self-flux method and then dissociated into nanosheets via the liquid-phase exfoliation technique. Curie temperature of FGT nanosheets powder is approximately 230 K, which is close to room temperature. FGT nanosheets as microwave absorber exhibit low reflection loss (RL) due to poor impedance matching. The microwave absorption properties of FGT nanosheets are improved by introducing graphene nanosheets (GNS). FGT@GNS 1–2 composites exhibit excellent microwave absorption performance. The minimum RL of FGT@GNS 1–2 reach − 44.43 dB at a microwave frequency of 9.9 GHz, when thickness is only 1.45 mm. This meets the requirements of strong RL and thin thickness of microwave absorption materials, indicating that FGT@GNS composites have a potential application for overcoming microwave pollution and radiation.