Abstract：Abstract: L10-FePt nanoparticles (NPs) with high ordering degree and good dispersion were successfully synthesized by using Mn doping. The results show that the dispersity, ordering degree (s) and coercivity of the FePt NPs were improved with the increase of reactive temperature. When the temperature is 360°C, the FePt NPs with average size of 8 nm and 0.903 of s were obtained. The Mn doping could cause lattice distortions, which effectively accelerate the migration of Fe and Pt atoms and promoted the orderly diffusion. Therefore, the L10-FePt NPs can be directly synthesized at a lower temperature. The heating rate plays an important role on the ordering degree of L10-FePt NPs. The faster and slower heating rate would lead to incomplete ordering diffusion of nanoparticles and less crystal nucleus of the ordering phase, respectively, which results lower ordering degree and the coercivity. The L10-FePt NPs with small size, good dispersity and high ordering degree can be prepared by doping Mn and reasonable synthesizing process.
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