Magnetic and electrical properties of M-type nano-strontium hexaferrite prepared by sol-gel combustion method

Herein, we report the synthesis of M-type nano-strontium hexaferrites co-doped with hetrovalent cations (Dy-Ni) having composition Sr(1-x)DyxFe12-yNiyO19 (x = 0.00-0.20, y = 0.00-0.80). The synthesized compounds were analyzed by XRD, FE-SEM, VSM, along with electrical resistivity and dielectric property analyses. XRD peak patterns revealed the magnetoplumbite-type hexagonal crystal structure of the synthesized materials. The SEM micrographs reflected the spherical and hexagonal shaped particles with an average size 40-50 nm. The magnetic squareness ratio (M-r/M-s) of the synthesized nano-ferrites particles lies in the range of 0.60-0.68 assuring their single magnetic domain nature. The rise in the values of saturation magnetization, remanence and coercivity reflect that the fabricated compounds can be beneficial for the perpendicular magnetic recording media. Both the electrical resistivity increment and decrease in dielectric energy loss with increasing Dy-Ni substitution level authenticates that such materials can find applications in magnetic recording media and microwave device fabrication. (C) 2017 Elsevier B.V. All rights reserved.