Currently, extensive research on Fabrication of magnetic nanoparticles for industrial and medical applications is in progress. Spinel ferrites, are an important class of these materials that in nano scale and in the size less than a critical size, show superparamagnet behavior. The purpose of this paper is to rovide sonochemical method for synthesis of magnesium ferrite nanoparticles (MgFe2O4) and investigate heir optical and magnetic properties. The nanostructure and morphology of nanoparticles were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM), respectively. The crystal structure of synthesized magnesium ferrite nanoparticles were cubic spinel structure. According to the TEM images, the average size of nanoparticles was 8 nm. The M-H hysteresis loop, at room temperature, was obtained using a vibrating sample magnetometer (VSM). The magnetic measurement results showed that the magnesium ferrite nanoparticles were superparamagnetic behavior. From the optical measurements of photoluminescence (PL) and UV-vis absorption spectra the optical band gap of the these nanoparticles were determined to be about 2.90eV.

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