Structure Optimization of FePt Nanoparticles of Various Sizes for Magnetic Data Storage |
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| Authors: | M. TANASE J.-G. ZHU C. LIU N. SHUKLA T.J. KLEMMER D. WELLER D.E. LAUGHLIN |
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| Affiliation: | (1) Argonne National Laboratory, Lemont, IL, USA;(2) Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, PA 15213, USA;(3) Nanosys Inc., Palo Alto, CA 94304, USA;(4) Institute for Complex Engineered Systems, Carnegie Mellon University, Pittsburgh, PA, USA;(5) Seagate Research, Pittsburgh, PA, USA |
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| Abstract: | Surfactant-coated, fcc disordered FePt nanoparticles of three different sizes between 3 and 7 nm were prepared and washed according to a modified reaction route based on Sun et al.[1] Hexane dispersions of nanoparticles were dried on transmission electron microscopy (TEM) grids, and the resulting monolayers were annealed by a sinter-free procedure at 600 °C and at 650 °C for 2 hours, respectively, developing the L10 phase while preserving their monodispersity. The order parameter of the L10 phase was measured using electron diffraction from statistically large ensembles of nanoparticles using an X-ray-like signal collection technique. The order parameter increases with particle size and with the temperature in the range 600 °C to 650 °C, being close to unity for the 7.2-nm particles annealed at 650 °C for 2 hours. Electronic supplementary material The online version of this article (doi: ) contains supplementary material, which is available to authorised users. This article is based on a presentation made in the symposium entitled “Phase Transformations in Magnetic Materials”, which occurred during the TMS Annual Meeting, March 12–16, 2006, in SanAntonio, Texas, under the auspices of the Joint TMS-MPMD and ASMI-MSCTS Phase Transformations Committee.
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