Investigation of structural, magnetic, and dielectric properties of BaFe₁₂O₁₉/Pr_1−xSr_xCo_yMn_1−yO₃ composites; an emerging aspirant for high frequency applications

Abstract In this work, barium hexaferrite/perovskite BaFe 12 O 19 /Pr 1-x Sr x Co y Mn 1-y O 3 composite ferrites were synthesized using single step sol–gel auto-combustion method. The lattice parameters and stabilized structural phases were studied using x-ray diffraction (XRD). The average crystallite size was found in the range of 51.6 nm–71.7 nm. Field Emission Scanning Electron Microscopy (FE-SEM) micrographs showed agglomerated particles having hexagonal as well as platelets like spherical shapes. Magnetic measurements done using vibrating sample magnetometer revealed that composite S3 (BaFe 12 O 19 /Pr 0.75 Sr 0.25 Co 0.25 Mn 0.75 O 3 ) exhibits low saturation magnetization (35.3 emu g −1 ), and coercivity (775 Oe). Dielectric analysis revealed that, at 1 MHz frequency, the tangent loss (1.3) and dielectric loss (22.5) are highest for the composite S3 (BaFe 12 O 19 /Pr 0.75 Sr 0.25 Co 0.25 Mn 0.75 O 3 ), whereas largest dielectric constant (20.7) was exhibited by S4 (BaFe 12 O 19 /Pr 0.5 Sr 0.5 Co 0.5 Mn 0.5 O 3 ). Similarly, composite S2 (BaFe 12 O 19 /PrMnO 3 ) (having the highest quality factor of 4.05) exhibited the largest resistivity (18885.8 Ω-cm), while composite S3 (BaFe 12 O 19 /Pr 0.75 Sr 0.25 Co 0.25 Mn 0.75 O 3 ) showed highest AC conductivity (0.00125 (Ω-cm) −1 ). The investigated composites are found excellent choice for designing devices for applications involving high-frequency interference and electromagnetic shielding due to their unique magnetic and dielectric properties.