Flower-like MoS 2 -coated magnetic Fe 3 O 4 /graphite nanosheet (GNs) spheres are used to prepare Fe 3 O 4 /GNs-MoS 2 composites with controllable electromagnetic (EM) wave-absorbing properties. The different particle size of Fe 3 O 4 plays an important role in the formation of Fe 3 O 4 / GNs-MoS 2 . Fe 3 O 4 /GNs-1-MoS 2 exhibits EM wave absorption properties with a minimum reflection loss (RL min ) value of −46.67 dB at 3.3 mm matching thickness; an effective absorption bandwidth (EAB) of 4.56 GHz can be achieved with 2.1 mm matching thickness. Meanwhile, Fe 3 O 4 /GNs-2-MoS 2 exhibits excellent EM wave absorption properties with an RL min of −55.96 dB at 2.1 mm; the EAB is 4.00 GHz at 1.5 mm with ultra-thin thickness. The superior EM wave absorption ability is related to the different morphology of Fe 3 O 4 /GNs-MoS 2 and the synergistic contribution between the various loss mechanisms and good impedance matching. This work explains and proves the prospect that the enhancement of EM wave absorption performance by different microstructures can be adjusted and controlled to enhance the absorption intensity of the composites and to expand their EAB. This is a promising method for manufacturing EM wave-absorbing materials with controllability.

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