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Synthesis, Self-assembly and Magnetic Properties of FePtCu Nanoparticle Arrays

Published online by Cambridge University Press:  11 February 2011

Xiangcheng Sun ,
S. S. Kang ,
J. W. Harrell ,
David E. Nikles ,
Z. R. Dai ,
J. Li  and
Z. L. Wang
Xiangcheng Sun
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama, 35487–0209
S. S. Kang
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama, 35487–0209
J. W. Harrell
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama, 35487–0209
David E. Nikles
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama, 35487–0209
Z. R. Dai
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245
J. Li
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245
Z. L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245
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Abstract

FePtCu nanoparticles with varying composition were synthesized by chemical solution-phase reduction of platinum and copper reagents and thermal decomposition of iron pentacarbonyl in the presence of oleic acid and oleyl amine stabilizers. As prepared the particles had fcc structure with an average diameter of 3.5 nm and were superparamagnetic. The particles were well dispersed in hydrocarbon solvents and could be self-assembled into two or three dimensions particles arrays with a variety of close-packing arrangements. Heat-treatment of the self-assembled films at temperatures above 550°C transformed the particles from the fcc to the L10 phase, giving in-plane coercivities as high as 9000 Oe. X-ray diffraction revealed that the Cu remained in the annealed FePtCu films and the presence of an extra peak, indicated a second phase was present. Consistent with one or more phases, the magnetic hysteresis curves could be decomposed into a hard component (Hc > 5,000 Oe) and a soft component (Hc < 2,000 Oe). Unlike our earlier results for Ag in FePt, adding Cu to FePt did not lower the temperature required for phase transformation from the fcc to the fct L10 phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 739: Symposium H – Three-Dimensional Nanoengineered Assemblies , 2002 , H7.40
Copyright
Copyright © Materials Research Society 2003

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References

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