synthesis and morphology of face centered cubic (fcc) fe-pt nanoparticles

fept nanoparticles with thermally stable room-temperature ferromagnetism are investigated. the monodisperse nanoparticles are prepared by chemical synthesis and a salt-matrix annealing technique. structural and magnetic characterizations confirm the phase transition from the disordered face-centered cubic structure. in this paper, 3 nm fept nanoparticles are first synthesized by superhydride reduction of fe and pt. transmission electron microscopy (tem) images show that the hard magnetic fept are agglomerated after annealing at 675°c. scanning electron microscopy (sem) images indicate that the size of fept nanoparticles increase by increasing of the annealing temperature.