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This paper reports the one-step synthesis of Cu–Zn–Ni–CoFe2O4/reduced graphene oxide (rGO) nanocomposites via a controllable hydrothermal method using hydrazine. In addition to controlling the growth of cobalt ferrite nanoparticles, hydrazine reduces graphene oxide to graphene and enables one-step synthesis. The characterization results showed that ferrite nanoparticles were dispersed on reduced graphene oxide plates. Next, the ability to absorb electromagnetic waves by the produced nanocomposite films was investigated. The results showed that graphene significantly increases the amount of absorption of electromagnetic waves of ferrites. To achieve the maximum absorption value, the optimal amount of graphene is required, so in the present work, the highest value of reflection loss (RL) was − 17.56 dB at 10.54 GHz, which was obtained for Cu0.16Zn0.17Ni0.17Co0.5Fe2O4/rGO(0.2 g) nanocomposite. [ABSTRACT FROM AUTHOR]