Monodisperse FePt nanoparticles were successfully synthesized using the chemical polyol process. Annealing at the high temperatures is required to achieve the hard ferromagnetic behavior with L10 phase. Annealing causes the surfactant surrounding particles to be decomposed. Under such circumstances, FePt particles are agglomerated, and their size increases. In this research, for the first time, Cu2O oxide particle with a high melting point was used as the shell around FePt core particles to prevent agglomeration. As the result coercivity, Hc, of FePt and FePt/Cu2O nanoparticles after annealing at 750 oC were equal to 10 and 4.5 kOe, respectively

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