The Effect of Composition and Structural Ordering on the Magnetism of FePt Nanoparticles
Spherical 4 nm FePt nanoparticles were synthesized by the simultaneous decomposition of Fe(CO)5 and the polyol reduction of Pt(acac)2. The final Fe-to-Pt composition was tuned between 15–55 at.% by varying the ingredient precursor ratios. The effect of composition and structural ordering on the macroscopic magnetic features of final FePt nanoparticles was examined via post-synthetic annealing stages at different conditions. Structural ordering is promoted in all cases, though samples approximating equiatomic Fe/Pt ratios eventually transform to fct-FePt phase while the FePt3-phase is favored for the Pt-richer samples. Consequently, the magnetic features of the annealed nanoparticles may be categorized; the hard magnetic FePt region dominating for Fe content between 40–55 at.% and the soft magnetic FePt3 region dominating in the region 20–30 at.% while Fe content less than 20 at.% results in Pt-richer phases with diminishing ferromagnetic behavior.
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Document Type: Research Article
Publication date: 2010-09-01
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