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, Fe(acac)3, and platinum acetyl acetonate, Pt(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 FexPt(100−x) was a linear function of Fe(acac)3 molar fraction. The highest room temperature coercivity (up to 10 kOe) was observed in Fe53Pt47 sample after annealed at 580 °C, which also exhibited the most ordered fct structure.