Abstract
Iron–platinum (FePt) nanoparticles were prepared by coreduction of H2PtCl6 and FeCl2 with hydrazine in water/triton X-100/cyclohexane microemulsions. The as synthesised FePt nanoparticles showed disordered face centred cubic (fcc) structure. After annealing at 700°C for 1 h, Pt3Fe phase was formed for samples with Fe/Pt molar ratios 1 : 1 and 1 : 3, while long range ordered L10 face centred tetragonal (fct) phase was formed for sample with Fe/Pt molar ratio of 3 : 1. The crystallite sizes of annealed FePt nanoparticles were 53, 61 and 22 nm for Fe/Pt molar ratios of 3 : 1, 1 : 1 and 1 : 3 respectively. The hysteresis loops measured by alternating gradient magnetometer (AGM) revealed that the Pt3Fe exhibited soft magnetic behaviour while fct FePt was a hard magnetic material and had higher coercivity. The physical sizes estimated from transmission electron micrograph (TEM) were similar to those of FePt nanoparticles calculated from X-ray diffraction (XRD) data.
Published Version
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