From Core/Shell Structured FePt/Fe3O4/MgO to Ferromagnetic FePt Nanoparticles

From Core/Shell Structured FePt/Fe3O4/MgO to Ferromagnetic FePt Nanoparticles

This paper reports an improved synthesis of hard magnetic fct-FePt nanoparticles (NPs) from reductive annealing of fcc-FePt/Fe3O4/MgO NPs followed by MgO removal. The fcc-FePt/Fe3O4 NPs are made by a one-pot reaction of Pt(acac)2 with Fe(CO)5 in the presence of oleic acid and oleylamine and are coat...

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Veröffentlicht in:Chemistry of materials 2008-12, Vol.20 (23), p.7242-7245
Hauptverfasser: Kim, Jaemin, Rong, Chuanbing, Lee, Youngmin, Liu, J. Ping, Sun, Shouheng
Format: Artikel
Sprache:eng
Schlagworte:
Magnetic Materials
Nanomaterials (Nanops, Nanotubes, etc.)
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Zusammenfassung:This paper reports an improved synthesis of hard magnetic fct-FePt nanoparticles (NPs) from reductive annealing of fcc-FePt/Fe3O4/MgO NPs followed by MgO removal. The fcc-FePt/Fe3O4 NPs are made by a one-pot reaction of Pt(acac)2 with Fe(CO)5 in the presence of oleic acid and oleylamine and are coated with a layer of MgO via the thermal decomposition of Mg(acac)2. The MgO coating prevents FePt from sintering under high temperature reductive annealing conditions. The fct-FePt NPs obtained from the 650 °C annealing of the fcc-FePt/Fe3O4/MgO NPs show a coercivity value of 2 T at 300 K, suitable for various nanomagnetic applications.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm8024878