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Title: Formation of FePt Nanoparticles Having High Coercivity

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [1];  [1]
  1. Vanderbilt University
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shared Research Equipment Collaborative Research Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931893
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society; Journal Volume: 128; Journal Issue: 44
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; SYNTHESIS; IRON ALLOYS; PLATINUM ALLOYS; NANOSTRUCTURES; CRYSTAL-PHASE TRANSFORMATIONS; COERCIVE FORCE; FePt; ferromagnetism; L10 ordering; TEM; nanoparticles; coercivity

Citation Formats

Rutledge, R.D., MorrisIII, William H, Wellons, M.S., Gai, Zheng, Shen, Jian, Bentley, James, Wittig, J. E., and Lukehart, C.M.. Formation of FePt Nanoparticles Having High Coercivity. United States: N. p., 2006. Web. doi:10.1021/ja0633868.
Rutledge, R.D., MorrisIII, William H, Wellons, M.S., Gai, Zheng, Shen, Jian, Bentley, James, Wittig, J. E., & Lukehart, C.M.. Formation of FePt Nanoparticles Having High Coercivity. United States. doi:10.1021/ja0633868.
Rutledge, R.D., MorrisIII, William H, Wellons, M.S., Gai, Zheng, Shen, Jian, Bentley, James, Wittig, J. E., and Lukehart, C.M.. Sun . "Formation of FePt Nanoparticles Having High Coercivity". United States. doi:10.1021/ja0633868.
@article{osti_931893,
title = {Formation of FePt Nanoparticles Having High Coercivity},
author = {Rutledge, R.D. and MorrisIII, William H and Wellons, M.S. and Gai, Zheng and Shen, Jian and Bentley, James and Wittig, J. E. and Lukehart, C.M.},
abstractNote = {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.},
doi = {10.1021/ja0633868},
journal = {Journal of the American Chemical Society},
number = 44,
volume = 128,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}