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FePt and Related Nanoparticles

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Nanoscale Magnetic Materials and Applications

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Abstract

This chapter reviews recent studies of chemically synthesized FePt and related nanoparticles. Various methods for synthesizing the nanoparticles and controlling their shape are described. Thermal effects in nanoparticles near the superparamagnetic limit are discussed. Some of the methods for reducing sintered grain growth during annealing to obtain the L10 phase are described, including the use of a hard shell, annealing in a salt matrix , and flash annealing . The effect of metal additives on the ordering temperature and on sintered grain growth is discussed. Additive Ag and Au significantly not only reduce the ordering temperature but also the grain growth temperature in close-packed 3-D arrays. Preliminary experiments that show additive Ag also reduces the ordering temperature when sintering is prevented. Easy-axis alignment of L10 FePt nanoparticles can be achieved by drying a nanoparticle dispersion in a magnetic field, and the effect of thermal fluctuations on orientation is discussed. Large particle-to-particle compositional distributions in chemically synthesized FePt nanoparticles have been measured. A method of determining the anisotropy distribution is described. Theoretical and experimental works showing the size effect on chemical ordering of FePt nanoparticles are discussed.

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Abbreviations

Nano-EDS:

nano-beam energy dispersed spectrometry

HRTEM:

high-resolution transmission electron microscopy

SCA:

strong coupling approximation

TEM:

transmission electron microscopy

TEOS:

tetraethoxysilane

THF:

tetrahydrofuran

TMA:

tetramethylammonium

VSM:

vibrating sample magnetometer

XRD:

X-ray diffraction

ZFC:

zero-field-cooled

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Acknowledgments

This work has been supported by the NSF Materials Research Science and Engineering Center Award No. DMR-0213985.

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Authors and Affiliations

  1. Department of Physics & Center for Materials for Information Technology, The University of Alabama, 35487-0209, Tuscaloosa, AL, USA

    J.W. Harrell & Shifan Shi

  2. Center for Materials for Information Technology, The University of Alabama, 35487-0209, Tuscaloosa, AL, USA

    Shishou Kang

  3. Department of Chemistry, Center for Materials for Information Technology, The University of Alabama, 35487-0209, Tuscaloosa, Alabama, USA

    David E. Nikles

  4. Department of Metallurgical and Materials Engineering, Center for Materials for Information Technology, The University of Alabama, 35487-0209, Tuscaloosa, Alabama, USA

    Gregory B. Thompson & Chandan Srivastava

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  1. J.W. Harrell
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  2. Shishou Kang
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  4. Gregory B. Thompson
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Correspondence to J.W. Harrell .

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Editors and Affiliations

  1. Dept. Physics, University of Texas, Arlington, Yates Street 502, Arlington, 76019, USA

    J. Ping Liu

  2. Center for Magnetic Recording Research, University of California, San Diego, Gilman Drive 9500, La Jolla, 92093-0401, USA

    Eric Fullerton

  3. Werkstoffforschung (IFW Dresden), Leibniz Institut für Festkörper- und, Helmholtzstr. 20, Dresden, 01069, Germany

    Oliver Gutfleisch

  4. Center for Materials Research &, University of Nebraska, Lincoln, Brace Laboratory 112, Lincoln, 68588-0113, USA

    D.J. Sellmyer

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Harrell, J., Kang, S., Nikles, D.E., Thompson, G.B., Shi, S., Srivastava, C. (2009). FePt and Related Nanoparticles. In: Liu, J., Fullerton, E., Gutfleisch, O., Sellmyer, D. (eds) Nanoscale Magnetic Materials and Applications. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-85600-1_18

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