Journal
CHEMISTRY OF MATERIALS
Volume 20, Issue 23, Pages 7242-7245Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm8024878
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Funding
- ONR/MURI [N00014-05-1-0497]
- INSIC
- GAANN fellowship
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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 degrees C annealing of the fcc-FePt/Fe3O4/MgO NPs show a coercivity value of 2 T at 300 K, suitable for various nanomagnetic applications.
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