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Journal of Applied Physics / Volume 101 / Issue 9 / PROCEEDINGS OF THE TENTH JOINT MMM/INTERMAG CONFERENCE / Hard Magnetic Materials

J. Appl. Phys. 101, 09K515 (2007); http://dx.doi.org/10.1063/1.2710811 (3 pages)

Bulk FePt/Fe3Pt nanocomposite magnets prepared by spark plasma sintering

Chuan-Bing Rong1, Vikas Nandwana1, Narayan Poudyal1, J. Ping Liu1, Tetsuji Saito2, Yaqiao Wu3, and Matthew J. Kramer3

1Department of Physics, University of Texas at Arlington, Arlington, Texas 76019
2Department of Mechanical Science and Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
3Ames Laboratory, Iowa State University, Ames, Iowa 50011 and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011

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(Received 27 October 2006; accepted 7 December 2006; published online 27 April 2007)

FePt/Fe3Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3O4 nanoparticles under 100 MPa at 400–600 °C. It was found that the phase transition of the FePt compound from the face centered cubic to the L10 started at 500 °C and was almost completed at 600 °C during the sintering. The activated atomic diffusion during the phase transition led to a significant increase in density. The density about 70% of the theoretical value has been obtained. Grain size of the sintered samples remains nanoscale even after a postannealing at 700 °C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.

© 2007 American Institute of Physics

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KEYWORDS and PACS

Keywords

iron alloys, platinum alloys, nanocomposites, ferromagnetic materials, nanotechnology, plasma materials processing, sintering, solid-state phase transformations, diffusion, grain size, exchange interactions (electron)

PACS

  • 75.50.Bb

    Fe and its alloys

  • 81.05.Mh

    Cermets, ceramic and refractory composites

  • 81.07.-b

    Nanoscale materials and structures: fabrication and characterization

  • 52.77.-j

    Plasma applications

  • 64.70.K-

    Solid-solid transitions

  • 75.30.Et

    Exchange and superexchange interactions

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2710811

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

    R. Skomski and J. M. D. Coey, Phys. Rev. B 48, 15812 (1993).

    C. B. Rong, H. W. Zhang, X. B. Du, J. Zhang, S. Y. Zhang, and B. G. Shen, J. Appl. Phys. 96, 3921 (2004)JAPIAU000096000007003921000001.

    Z. J. Guo, J. S. Jiang, J. E. Pearson, S. D. Bader, and J. P. Liu, Appl. Phys. Lett. 81, 2029 (2002)APPLAB000081000011002029000001.

    T. Saito, J. Appl. Phys. 99, 08B522 (2006)JAPIAU00009900000808B522000001.

    C. B. Rong, H. W. Zhang, B. G. Shen, and J. P. Liu, Appl. Phys. Lett. 88, 042504 (2006)APPLAB000088000004042504000001.


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