Enhanced magnetic properties of substituted Sr-hexaferrite nanoparticles synthesized by co-precipitation method

Nanoparticles of Mg–Co–Ti substituted strontium hexaferrite with nominal composition of SrFe12−2x(Mg,Co)x/2TixO19 (x=0–2.5) were synthesized by a co-precipitation method. The structural, magnetic and electromagnetic properties of samples were studied as a function of x by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and vector network analysis. It was found that the particle size decreases with an increase in Mg–Co–Ti substitution. The XRD results showed that the crystallite size of nanoparticles lies in the range of 40–45 nm. The results of hysteresis loops indicated that for x>0.5, Ms and Hc decrease with an increase in x. Vector network analysis measurements showed that the doped samples had much more effective reflection loss values than those of undoped ferrites. As a result it was found that Mg–Co–Ti doped Sr-hexaferrite can be proposed as suitable absorbers for applications in microwave technology with a good deal of consistently.