Magnetic properties of Sb-doped FePt nanoparticles
Yan, Q. Y.
Gambino, R. J.
Date of Issue2006
School of Materials Science and Engineering
Sb-doped FePt nanoparticles with an average diameter of 8.5 nm were prepared by thermal decomposition of platinum acetylacetonate, antimony acetate, and iron pentacarbonyl. Upon annealing to ~300°C for 30 min, nanoparticles with XSb=0.14 and 0.23 show Hc>500 mT, and L10 ordering parameter S values of ~0.83–0.87. Transmission electron microscopy of the annealed assemblies shows no observable nanoparticle coalescence at 300°C. Low-temperature coercivity measurements with a superconducting quantum interference device indicate the presence of particles that exhibit superparamagnetism, probably due to the large particle size distribution or inhomogeneity in Sb incorporation. Our results underscore the necessity to synthesize monodisperse FePt nanoparticles with controlled composition to maximize ferromagnetic behavior.
Journal of applied physics
© 2006 American Institute of Physics. This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at: [DOI: http://dx.doi.org/10.1063/1.2170060]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.