LAUSR

Samples having the composition BaFe 12−2 x Co x Sm x O 19 ( x  = 0.0, 0.2, 0.4, 0.6) are prepared by a WOWS (without water and surfactants) sol–gel technique, and the structural, morphological, and AC and DC electrical and magnetic properties of the samples are investigated. The phase formation of M-type hexaferrite is studied by using indexed x-ray diffraction patterns. Scanning electron microscopy images show that the particle size of the synthesized nanopowder varies from 295 nm to 440 nm. The dielectric constant ( ε ′) exhibits a decreasing trend while the dielectric loss (tan δ ) increases with increased doping. DC electrical resistivity ( ρ DC ) is investigated in a temperature range of 373–673 K and indicates an increasing trend with doping. The magnetic hysteresis loops reveal an increase in saturation magnetization ( M s ) and remanence ( M r ), and a decrease in coercivity ( H c ), with the increase in doping content.