Superparamagnetic Behavior of the Magnetic Hysteresis Loop in the Fe2O3@Pt Core-Shell Nanoparticles

Studies of the magnetization of Fe2O3@Pt nanoparticles at room temperature showed that there is superparamagnetic contribution with high saturation magnetization about 12.35(emu/g), and soft ferromagnetic contribution with narrow coercive field about 58(Oe). In this paper we fitted the hystersis loop of sample with Brillouin function that demonstrating existence of superparamagnetic phase. Total angular momentum quantum number J With computations performance, gave consistent value at high level that could be the reason into existence of spin clusters. Upshot theoretically, magnetic susceptibility of this sample was calculated from the Brillouin function at fields less than 1000(Oe) from 0.1 to 400 K to determine the high-temperature susceptibility. Keywords: α-Fe2O3@Pt core-shell nanoparticles, Magnetization, Superparamagnetic, Brillouin function, Susceptibility.