<p>This investigation employed the sol-gel technique to prepare Co²⁺-Cu²⁺ doped M-type barium-strontium hexagonal ferrite. X-ray diffraction (XRD), along with field emission scanning electron microscopy (FESEM), have been utilized to investigate the crystal structure and morphology of the grains, respectively. An impedance analyzer was utilized to evaluate electrical parameters at room temperature. The formation of an M-type hexagonal crystal *-structure was confirmed by the X-ray diffraction profile, along with minor traces of hematite. In SEM analysis, it was seen that as doping levels are increased, the small size of each grain becomes prominent in the grain clusters, giving rise to a prominent rice-grain shape. The dielectric loss tangent is increased, and the dielectric constant is decreased as doping levels rise. The interplay between grain boundaries and grains has a notable impact on relaxation characteristics across various doping concentrations, leading to the presence of both strong and partial relaxations in low and high-frequency domains. This behavior contributes to the development of either depressed or expanded semicircles influenced by the interactions at grain and grain boundary levels. Analysis of the Cole-Cole plots for electric modulus indicated significant conductivity relaxation. Different relaxation periods were observed in correlation with the conductivity relaxation, and spectra of the electric modulus confirmed the material’s non-Debye behavior.</p> Graphical Abstract <p></p>