Abstract
Polyaniline (PANI)/Cobalt-manganese ferrite, (PANI)/Co 0.5 Mn 0.5 Fe 2 O 4 , nanocomposite was synthesized by oxidative chemical polymerization of aniline in the presence of ammonium peroxydisulfate (APS). Microwave assisted synthesis method was used for the fabrication of core CoFe 2 O 4 nanoparticles. The structural, morphological, thermal and magnetic properties of the nanocomposite were investigated in detail by X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The average crystallite size of (PANI)/Co 0.5 Mn 0.5 Fe 2 O 4 nanocomposite by the line profile method was 20±9 nm. The magnetization measurements revealed that (PANI)/Co 0.5 Mn 0.5 Fe 2 O 4 nanocomposite has superparamagnetic behavior with blocking temperature higher than 300 K. The saturation magnetization of the composite is considerably low compared to that of CoFe 2 O 4 nanoparticles due to the partial replacement of Co 2+ ions and surface spin disorder. As temperature decreases, both coercivity and strength of antiferromagnetic interactions increase which results in unsaturated magnetization of the nanocomposite.
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