The effect of composition and structural ordering on the magnetism of FePt nanoparticles |
| |
Authors: | Kalogirou O Angelakeris M Dendrinou-Samara C Mourdikoudis S Simeonidis K Gloystein K Vilalta-Clemente A Tsiaoussis I |
| |
Affiliation: | Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece. |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|