Synthesis, chemical ordering, and magnetic properties of FePtCu nanoparticle films

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Title: Synthesis, chemical ordering, and magnetic properties of FePtCu nanoparticle films
Author: Sun, Xiangcheng ; Kang, Shishou ; Harrell, J. W. ; Nikles, David E. ; Dai, Z. R. ; Li, Jing ; Wang, Z. L. (Zhong Lin)
Abstract: FePtCu nanoparticles with varying composition were prepared by the simultaneous polyol reduction of platinum acetylacetonate and copper bis(2,2,6,6-tetramethyl-3,5-heptanedionate) and the thermal decomposition of iron pentacarbonyl. As prepared the particles had a fcc structure with an average diameter of 3.5 nm and were superparamagnetic. Heat treatment of the self-assembled films at temperatures above 550 °C transformed the particles from the fcc to the L1₀ phase, give in-plane coercivities as high as 9000 Oe. X-ray diffraction revealed that the Cu remained in the films and the presence of an extra peak, indicating a second phase was present. Consistent with two or more phases, the magnetic hysteresis curves could be decomposed into a hard component (H[subscript c]c>5000 Oe) and a soft component (H[subscript c]c<2000 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 L1₀ phase.
Description: ©2003 American Institute of Physics. The electronic version of this article is the complete one and can be found online at: DOI:10.1063/1.1543863
Type: Article
ISSN: 0021-8979
Citation: Journal of Applied Physics, 93 (2003) 7337-7339
Date: 2003-05-15
Contributor: Georgia Institute of Technology. School of Materials Science and Engineering
University of Alabama. Center for Materials for Information Technology
Publisher: Georgia Institute of Technology
American Institute of Physics
Subject: Iron alloys
Platinum alloys
Copper alloys
Magnetic particles
Magnetic thin films
Materials preparation
Particle size
Heat treatment
Solid-state phase transformations
Coercive force
X-ray diffraction
Phase separation
Magnetic hysteresis
Ferromagnetic materials
Magnetic recording

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