Formation of FePt Nanoparticles Having High Coercivity

Journal Article · Sun Jan 01 04:00:00 EST 2006 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja0633868· OSTI ID:931893

Rutledge, R. D. ^[1]; MorrisIII, William H ^[1]; Wellons, M. S. ^[1]; Gai, Zheng ^[2]; Shen, Jian ^[2]; Bentley, James ^[2]; Wittig, J. E. ^[1]; Lukehart, C. M. ^[1]

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1. Vanderbilt University
2. ORNL

Ultrasonication of toluene solutions of the heteropolynuclear cluster complex, Pt{sub 3}Fe{sub 3}(CO){sub 15}, in the presence of oleic acid and oleylamine affords surface-capped fcc FePt nanoparticles having an average diameter of ca. 2 nm. Self-assembled arrays of these nanoparticles on oxidized Si wafers undergo a fcc-to-fct phase transition at 775 C to form ferromagnetic FePt nanocrystals ca. 5.8 nm in diameter well dispersed on the Si wafer surface. Room-temperature coercivity measurements of these annealed FePt nanoparticles confirm a high coercivity of ca. 22.3 kOe. Such high coercivity for fct FePt nanoparticles might result from use of a heterpolynuclear complex as a single-source precursor of Fe and Pt neutral atoms or from use of ultrasonication to form fcc FePt nanoparticles under conditions of exceptionally rapid heating. Experiments to determine the critical experimental conditions required to achieve such high room-temperature coercivities in ferromagnetic nanoparticles are underway.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931893
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 44 Vol. 128; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
COERCIVE FORCE
CRYSTAL-PHASE TRANSFORMATIONS
FePt
IRON ALLOYS
L10 ordering
NANOSTRUCTURES
PLATINUM ALLOYS
SYNTHESIS
TEM
coercivity
ferromagnetism
nanoparticles