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Synthesis and Self-Assembly of Films Containing FeCoPt Nanoparticles

Published online by Cambridge University Press:  21 March 2011

Min Chen  and
David E. Nikles
Min Chen
Affiliation:
The University of Alabama, Tuscaloosa, Center for Materials for Information Technology, Box 870209, Tuscaloosa, Alabama, 35487-0209, US
David E. Nikles
Affiliation:
The University of Alabama, Tuscaloosa, Center for Materials for Information Technology, Box 870209, Tuscaloosa, Alabama, 35487-0209, USdnikles@mint.ua.edu
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Abstract

Fe49Co7Pt44 and Fe40Co17Pt43nanoparticles were synthesized by simultaneous chemical reduction of platinum acetylacetonate and cobalt acetylacetonate and thermal decomposition of iron pentacarbonyl. As-prepared the particles had a disordered face-centered cubic lattice with an average diameter of 3.2 nm and were superparamagnetic. These particles were well dispersed in a 50/50 mixture of hexane and octane. The particles self-assembled into ordered superlattices when deposited onto carbon coated Cu TEM grids or onto single crystal Si (100) substrates. After vacuum annealing (from 500°C to 700 °C), the particles transformed to the tetragonal phase. The coercivity of the film strongly depended on the composition and annealing temperature. For the Fe49Co7Pt44film, coercivity of 8700 Oe and a squareness of 0.75 after annealing at 700 °C for 30 minutes. XPS shows existance of oxidized iron and cobalt on the surface of film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , U4.7
Copyright
Copyright © Materials Research Society 2001

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References

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