Magnetic Properties of FexPtyAu100−x−y Nanoparticles
FexPtyAu100−x−y nanoparticles of size 3.5 nm were prepared by polyol reduction of platinum acetylacetonate and gold acetate and the thermal decomposition of iron pentacarbonyl. The as-synthesized nanoparticles with disordered fcc structure were then heat treated to transform to the L10 structure with high magnetocrystalline anisotropy. By tuning the stoichiometry of the FexPtyAu100−x−y nanoparticles, the phase transition temperature was reduced by more than 200 °C. After the annealing 500 °C, for instance, the highest coercivity of 18 kOe was obtained from the Fe51Pt36Au13 nanoparticles which is substantially higher compared to 2 kOe for Fe51Pt49 nanoparticles annealed at the same temperature. In addition to the high coercivity, the saturation magnetization value obtained from Fe51Pt36Au13 nanoparticles was 47 emu/g which is similar to that for the Fe51Pt49 nanoparticles, indicating that there is no trade-off between the coercivity and the saturation magnetization upon Au doping.
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Document Type: Research Article
Publication date: 2010-05-01
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