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Journal of Applied Physics / Volume 99 / Issue 8 / PROCEEDINGS OF THE 50TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / L10 and Other Hard Magnetic Materials

J. Appl. Phys. 99, 08E916 (2006); http://dx.doi.org/10.1063/1.2176892 (3 pages)

Finite-temperature anisotropy of magnetic alloys

R. Skomski1, O. N. Mryasov2, J. Zhou3, and D. J. Sellmyer3

1Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588 and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588
2Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588 and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588 and Seagate Research, 1251 Waterfront Place, Pittsburgh, Pennsylvania 15222-4215
3Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588

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(Published online 27 April 2006)

The temperature dependence of the magnetic anisotropy of ferromagnetic materials is analyzed. Simple ferromagnets, such as Fe and Co, obey the m = n(n+1)/2 power laws predicted by the Callen and Callen [Phys. Rev. 129, 578 (1963) ] theory, but in alloys, the applicability of the theory is an exception rather than the rule. Many alloys, such as the rare-earth transition-metal intermetallics and L10 magnets, violate a basic assumption of the theory, namely, that the single-ion anisotropy and the spontaneous magnetization have the same origin. This is the reason for significant deviations from the Callen and Callen behavior, such as the m = 2 law we obtained for L10 alloys.

© 2006 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. QUANTUM-MECHANICAL BACKGROUND
  3. SIMPLE FERROMAGNETS
  4. INTERMETALLIC ALLOYS
  5. DISCUSSION AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

cobalt alloys, iron alloys, ferromagnetic materials, magnetic anisotropy

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2176892

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (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.
    J. F. Herbst, Rev. Mod. Phys. 63, 819 (1991).

    K. Kumar, J. Appl. Phys. 63, R13 (1988)JAPIAU000063000006000R13000001.

    R. Skomski, J. Appl. Phys. 83, 6724 (1998)JAPIAU000083000011006724000001.

    J. B. Staunton, S. Ostanin, S. S. A. Razee, B. L. Gyorffy, L. Szunyogh, B. Ginatempo, and E. Bruno, Phys. Rev. Lett. 93, 257204 (2004).

    E. R. Callen and H. B. Callen, Phys. Rev. 129, 578 (1963).

    R. Skomski, J. Appl. Phys. 91, 8489 (2002)JAPIAU000091000010008489000001.


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