Hyperfine interactions, Raman spectroscopy and magnetic properties of Pr3+-Co2+substituted M-type strontium hexaferrites

Investigations were conducted on the cation distribution and magnetic characteristics of M -type strontium hexaferrites substituted with Pr3+ and Co2+. The Raman modes that have been observed are typical modes of Mtype hexaferrites in single phase. Raman modes corresponding to vibration of the entire spinel block, trigonal bipyramidal[2b (up arrow)], tetrahedral [4f1 (down arrow)] as well as octahedral [12k (up arrow), 2a (up arrow), and 4f2 (down arrow)] crystallographic sites as a result of A1g, E1g and E2g symmetry are revealed by the analysis of the Raman spectra. The preference of Co2+ ions for the site where they replace Fe3+ was identified as the cause of the variation in the magnetic parameters. Since each sample has a squareness ratio value greater than0.5, it can be concluded that they possess a single magnetic domain structure. The Mo center dot ssbauer analysis suggests that the high spin state of the Fe3+ ions is responsible for all five sexes, as indicated by the range of delta values (0.05 to 0.5 mm/s) for Fe3+. When Pr3+-Co2+ doping increases, the relative area values of the 2b site decrease, suggesting that Co2+ prefers to occupy the 2b site. The magnetic properties of the M -type hexagonal structure have been tuned as a result of the doping of Pr3+ and Co2+ cations on the structure. The produced samples have potential applications as permanent magnets and in magnetic recording media.