Abstract
We report direct synthesis of chemically ordered FePt nanoparticles using microwave irradiation during polyol reaction at 250 {degree sign}C under high pressure without any post- synthesis treatments. An X-ray diffraction pattern of as- synthesized FePt nanoparticles shows superlattice peaks. Mössbauer analysis exhibits the FePt nanoparticles having partially ordered L10 structure, and the fraction of Fe atoms in the chemically ordered L10 structure to the total amount of Fe atoms is 57 %. Coercivity and saturation magnetization of the partially ordered FePt nanoparticles are 3.4 kOe and 49 emu/g at room temperature, respectively. An evaluation of the anisotropy-field distribution using Flanders-Shtrikman method reveals that the FePt sample includes nanoparticles with anisotropy fields much lower than the anisotropy field HkWr of 85 kOe obtained by rotational hysteresis loss measurements.
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