Graphene-doped high-efficiency absorbing material: C-Mn0.5Zn0.5Fe2O4@PDA

MnZn ferrites and their magnetic, electrical, and optical properties make them highly suitable in a number of applications. These ferrites are used in electronic applications, magnetic fluids, and household appliances such as washing machines, refrigerators, and microwave ovens. This paper focuses on a hydrothermal method used to prepare a bayberry spherical manganese–zinc ferrite (Mn0.5Zn0.5Fe2O4), its surface was coated with dopamine (Mn0.5Zn0.5Fe2O4@PDA) and then carbonized to obtain the core–shell structure C-Mn0.5Zn0.5Fe2O4@PDA. Preliminary results show that carbon-coated manganese–zinc ferrite with saturation magnetic properties and coercivity increased from 99 emu and 66.01 Oe to 138 emu and 104.85 Oe, respectively. In addition, the carbonized Mn0.5Zn0.5Fe2O4@PDA (C-Mn0.5Zn0.5Fe2O4@PDA) exhibited favorable microwave absorbing performance with minimum reflection loss (RLmin) of − 17.56 dB and also revealed that the broadest effective absorption bandwidth (RLmin ≤ − 10 dB) 5.36 GHz (11.70–17.06 GHz) can be achieved at 2.0 mm.