The as-prepared and heat treated iron/cobalt nanoparticles were obtained by iron chloride hexahydrate (FeCl3.6H1O) and cobalt chloride hexahydrate (FeCl3.6H1O) as precursor in the presence of sodium borohydride agent. The samples were characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) in different temperature. XRD pattern of FeCo samples showed ...