Preparation of high coercivity magnetic FePt nanoparticles by liquid process

Abstract

FePt nanoparticles have been synthesized using a liquid process, by mixing two precursor liquids: ferric acetyl ferric acetyl acetonate, $\mathrm{Fe}{\mathrm{(acac)}}_3,$ and platinum acetyl acetonate, $\mathrm{Pt}{\mathrm{(acac)}}_2$ in polyol solution of sodium hydroxide at high temperatures. To avoid the agglomeration of the produced particle, aminoethoxy ethanol has been used. The particle size was monodisperse and non- agglomerating. The fraction of Fe in ${\mathrm{Fe}}_x{\mathrm{Pt}}_{\text{(100−x)}}$ was a linear function of $\mathrm{Fe}{\mathrm{(acac)}}_3$ molar fraction. The highest room temperature coercivity (up to 10 kOe) was observed in ${\mathrm{Fe}}_{53}{\mathrm{Pt}}_{47}$ sample after annealed at 580 °C, which also exhibited the most ordered fct structure.