Microwave-assisted chemical reduction routes for direct synthesis of Fe–Pt nanoparticles in ordered face centered tetragonal L10 phase

Abstract

In the present work, microwave-assisted chemical reduction route has been explored for the direct synthesis of face centered tetragonal (fct) L10 phase of Fe–Pt nanoparticles. Effects of microwave power and irradiation time on the growth process were investigated. Using this facile and high yield technique we could tune particle size from 7 to 17 nm. The as-prepared Fe–Pt NPs were observed in ordered fct L10 phase without any post-synthesis treatment. The particle size and magnetic properties of the as-prepared Fe–Pt were found to be very sensitive to the microwave irradiation power, while influence of exposure time was insignificant. The hysteresis measurements were performed at room temperature (300 K) to study magnetic properties of as-synthesized Fe–Pt as a function of crystallite size. All specimens of Fe–Pt were found to exhibit ferromagnetic behavior at room temperature. Coercivity and saturation magnetization were observed to be decreasing with diminishing particle size. The microwave-assisted route is found to be a simple technique for direct synthesis of metal alloys and may prove to be a potential tool of high density data storage materials such as Fe–Pt.