Ordered FePt nanoparticle arrays prepared by a micellar method

We prepared L1₀ phase FePt nanoparticle arrays on Si by a micellar method combined with plasma treatment, in-situ deposition of a Si0₂ overlayer, and a post-annealing. The FePt nanoparticle arrays exhibit a quasi-hexagonal order with tailored inter-particle spacing and particle size. Transformation of L1₀ FePt was achieved for the annealed samples. In addition, the ordering temperature of FePt nanoparticles was reduced by 50~100°C by Au or Ag doping. The micellar method has a high potential in preparing FePt nanoparticle arrays used for ultrahigh density recording media.