Abstract
The composition, crystal structure, and magnetic properties of chemically synthesized FePt nano-particles were investigated. The composition of these particles is closely related to the crystal structure. FePt nano-particles with a composition range of 53.3 < Fe (atomic %) < 70 show high coercivity after annealing at 600°C in vacuum, and are transformed from a chemically disordered fcc structure to a chemically ordered L10 phase. An annealed film of Fe63Pt37 nano-particles has an out-of-plane coercivity of 11450 Oe. We applied the Langmuir-Blodgett technique for mono-layer fabrication of FePt nano-particles. The obtained mono-layer, with a thickness of 6 nm, has a hexagonal-like close-packed assembly with an are of 12×20cm2.
