Size control and magnetic properties of FePt nanoparticles

FePt nanoparticles formed through polyol reduction are annealed to convert the internal particle structure from a chemically disordered face-centered cubic (fcc) phase to the chemically ordered face-centered tetragonal (fct or L1₀) phase. During the same process, nanoparticle superlattices are transformed into ferromagnetic nanoparticle assemblies. The novel synthetic procedure to control the size of FePt nanoparticles by changing the precursor and/or the reaction procedure is also studied.