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Core–shell structure of chemically synthesised FePt nanoparticles: a comparative study

Michael Delalande 1 Pierre R. Marcoux 2 Peter Reiss 2 Yves Samson 1 
1 NM - Nanostructures et Magnétisme
SP2M - UMR 9002 - Service de Physique des Matériaux et Microstructures : DSM/INAC/SP2M
Abstract : We carried out solution synthesis of FePt nanoparticles through different chemical methods, using four “hot soap methods”, i.e. the particle formation in the presence of surfactant molecules at high temperatures, and one polyol process. Structural and magnetic properties of the as-made particles 15 pointed to a core-shell structure for the particles prepared with hot soap methods, with an irondepleted core surrounded by a pure iron shell. Such a structure has an impact on the magnetic properties of as-made particles since Fe atoms from shell are oxidised and non magnetic. We proved however that iron atoms of this shell are available during the formation of the ordered phase upon annealing: L10 phase for small particles, L12 for bigger ones. In contrast, the core-shell 20 structure was not observed in the case of nanoparticles synthesised according to the polyol process. This outlines the key role of the stabilising ligands, long alkyl chain surfactants in the former case and tetraethylene glycol in the latter.
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Michael Delalande, Pierre R. Marcoux, Peter Reiss, Yves Samson. Core–shell structure of chemically synthesised FePt nanoparticles: a comparative study. Journal of Materials Chemistry, Royal Society of Chemistry, 2007, 17 (16), pp.1579-1588. ⟨10.1039/b614209e⟩. ⟨cea-02528443⟩



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