Study of low-temperature ordering and crystal structure in FePtBi/Au nanocomposite films

Based on interfacial microstructure control of FePt/Au multilayer structure and surfactant Bi atoms, an FePtBi/Au nanocomposite film was designed to achieve good properties [low-temperature ordering, good perpendicular magnetic anisotropy (PMA), and no interparticle exchange coupling (IEC)] in this paper. The ordering process was promoted due to the increase of concentration of defects by adding appropriate surfactant Bi atoms. Thus, the ordering temperature of this film can be decreased from 500 to 450 C. Meantime, the FePtBi/Au nanocomposite film maintains good PMA and low IEC with the texture manipulation of Au layers and control of total film thickness. (orig.)