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Applied Physics Letters / Volume 89 / Issue 12 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 89, 122509 (2006); http://dx.doi.org/10.1063/1.2355448 (3 pages)

In-cluster-structured exchange-coupled magnets with high energy densities

X. Rui1, J. E. Shield1, Z. Sun2, Y. Xu2, and D. J. Sellmyer2

1Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588
2Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588

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(Received 5 June 2006; accepted 27 July 2006; published online 19 September 2006)

In this letter, the authors demonstrate isotropic Fe–Pt exchange-spring nanocomposite permanent magnets with a soft magnetic phase fraction of greater than 0.5 with a coercivity of 6.5 kOe, single-phase-like magnetic behavior, and an energy product of 25.1 MG Oe. Sub-10-nm Fe–Pt clusters are formed with compositions in the two-phase Fe3Pt and FePt regions. Intracluster structuring on a scale of a few nanometers occurs after appropriate heat treatment. This ensures full exchange coupling between the two phases, allowing greater soft magnetic phase fractions. The results provide insight into developing high energy product nanostructured permanent magnets.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

iron alloys, platinum alloys, ferromagnetic materials, nanocomposites, nanotechnology, metal clusters, permanent magnets, exchange interactions (electron), heat treatment, coercive force

PACS

  • 75.50.Bb

    Fe and its alloys

  • 75.50.Ww

    Permanent magnets

  • 75.50.Vv

    High coercivity materials

  • 75.30.Et

    Exchange and superexchange interactions

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 81.16.-c

    Methods of micro- and nanofabrication and processing

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2355448

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

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

For access to fully linked references, you need to log in.
    R. Skomski and J. M. D. Coey, Phys. Rev. B 48, 15812 (1993).

    J. E. Shield, J. Zhou, S. Aich, V. Ravindran, R. Skomski, and D. J. Sellmyer, J. Appl. Phys. 99, 08B508 (2006)JAPIAU00009900000808B508000001.

    Y. Gao, D. Shindo, and A. K. Petford-Long, J. Appl. Phys. 93, 8119 (2003)JAPIAU000093000010008119000001.

    S. H. Baker, S. C. Thornton, A. M. Keen, T. I. Preston, C. Norris, K. W. Edmonds, and C. Binns, Rev. Sci. Instrum. 68, 1853 (1997)RSINAK000068000004001853000001.

    S. H. Baker, S. C. Thornton, K. W. Edmonds, M. J. Maher, C. Norris, and C. Binns, Rev. Sci. Instrum. 71, 3178 (2000)RSINAK000071000008003178000001.

    J. Li, Z. L. Wang, H. Zeng, S. Sun, and J. P. Liu, Appl. Phys. Lett. 82, 3743 (2003)APPLAB000082000021003743000001.


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