One-pot simplified co-precipitation procedure was used to produce non-stoichiometric ferrite (Co0.5Mn0.3Cu0.2Fe2O4) and diminish graphene oxide (rGO) nano-composites in this investigation. Powders such as XRD, FT-IR, and SEM were used to study the structural and surface analysis of the composites. An investigation of the magnetic characteristics of Co0.5Mn0.3Cu0.2Fe2O4 nanocomposites (NCs) was also conducted using VSM. A vector network analysis tool was used to conduct microwave adsorption investigations on Co0.5Mn0.3Cu0.2Fe2O4 NCs in the 2–18 GHz frequency spectrum. By adjusting the amount of rGO added to Co0.5Mn0.3Cu0.2Fe2O4, the electromagnetic (EM) wave absorbing characteristics of Co0.5Mn0.3Cu0.2Fe2O4 nanocomposites may be remarkably adaptable due to their customizable microstructure and synergistic effects. The addition of rGO can significantly improve EM wave absorption characteristics compared to the unadulterated Co0.5Mn0.3Cu0.2Fe2O4 ferrites. The generated Co0.5Mn0.3Cu0.2Fe2O4 NCs' minor reflection loss (RL) was 39.7 dB in the 11.9 GHz frequency spectrum. The effective absorption bandwidth is a maximum of 6.5 GHz (RL under 10 dB) with a thickness of two millimeters. The Co0.5Mn0.3Cu0.2Fe2O4 NCs that haven't been changed since synthesis (: as-synthesized) might be considered a novel alternative for the slight EM wave absorber due to their proper impedance matching and synergistic effect among dielectric and magnetic loss.
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