Abstract
Cd2+ doped cobalt ferrite magnetic nanoparticles with the formula CdxCo1-xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) were successfully synthesized and coated by silica shell. The effects of non-magnetic Cd+2 doping and silica coating on structural, magnetic, and optical properties of CoFe2O4 nano-particles had been investigated. XRD patterns confirmed that all samples were found to have a cubic spinel structure with average crystallite sizes 15–43 nm. It was observed that increasing the amount of Cd2+ up to certain amount (x = 0.4) leads to an increase of saturation magnetization. The band gap energy tends to increase with silica coating and increasing in Cd2+ content to reach maximum value of 1.61 eV for Cd0.5Co0.5Fe2O4/SiO2 sample, which implies that this material is a good candidate for using in magnetic data storage and applications that rely on magneto-optical properties.
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