LAUSR

Fe3O4 nanoparticles, coated with polyvinylpyrrolidone (PVP) + polyvinyl chloride (PVC), were synthesized using cathodic electrochemical deposition (CED) technique. Physical properties of the uncoated and PVP + PVC-coated nanoparticles were investigated using several methods including X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), Fourier transform infrared (FT-IR), and AC susceptometer. In both the samples, single-phase formation in cubic spinel structure is detected in the XRD analysis. In this study, the mean crystallite size of the prepared specimens is found to be varied from 10.2 to 8.7 nm after PVP + PVC coating. The results of the FT-TR test thoroughly verified the existence of PVP/PVC layer onto the surface of the electrodeposited NPs, and magnetic results also confirmed a superparamagnetic (SPM) behavior at room temperature for both of them. Coercivity and magnetization saturation reduction have also been observed, despite having lower grain size. Also, weak magnetic interactions of inter-particle and a superspin glass-like behavior at low temperatures are confirmed. In addition, increasing of PVP + PVC content on the surface coating of the magnetic nanoparticles has decreased the inter-particle interactions.