Magnetic Properties of Copper and Manganese Co-doped Cobalt Ferrites Nanoparticles by Sol-Gel Method

Abstract

Cobalt ferrite nanoparticles with norminal formula of Co1-(x+y)CuxMnyFe2O4 have been synthesized by sol -gel method. The cobalt ion are replaced by copper and manganese ion (x + y = 0.08). Phase identification was performed by XRD techniques and crystallite sizes were obtained using Scherrer’s formula. All sample indicated that single phase of cobalt ferrite nanoparticles with crystallite sizes in the range of 31-45 nm. Lattice parameters (a) and X-ray density (dx) were calculated by Rietveld refinement technique. Results inversely display between lattice parameters and X-ray density due to difference elements ionic radius. The SEM image shows a narrow particle size distribution in co-doping sample. In addition, the EDX results indicate that cobalt (Co), copper (Cu), manganese (Mn), iron (Fe) oxygen (O) and impurity phase. The Hysteresis loops are measured by VSM showed ferrimagnetic behavior. The saturation magnetization, coercive field and squareness were non-lilearly changing with copper and manganese.