The effect of magnetic feild on the properties of Fe3O4 nanoparticles synthesized by co-precipitation method

In this paper, Fe3O4 magnetic nanoparticles were synthesized by a co-precipitation method at room temperature with and without magnetic field during the synthesizing process. Their magnetic properties were measured by vibrating sample magnetometer (VSM) instrument. VSM was used for studding the paramagnetic properties of the nanoparticles and the effect of the magnetic field on the magnetic properties of nanoparticles. The results showed that the sample synthesized in the presence of magnetic field has the saturation magnetization value as about 42 emu/gr. The saturation magnetization value for the synthesized sample in the absence of magnetic field is about 64 emu/gr. The X-ray diffraction (XRD) pattern revealed the low crystallinity for the synthesized nanoparticles in the presence of magnetic field in comparison with synthesized nanoparticles in the absence of magnetic field. The Fourier-transform infrared (FTIR) spectroscopy confirmed the chemical bond formation of the magnetic nanoparticles. The scanning electron microscopy (SEM) images showed the morphology of the nanoparticles. The reduction of saturation magnetization value and the crystallinity of nanoparticles can be related to the magnetic dipole orientation by the magnetic field during the synthesizing.