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Finite-temperature anisotropy of magnetic alloys
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10.1063/1.2176892
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    Affiliations:
    1 Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588 and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588
    2 Department 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
    3 Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588
    a) Electronic mail: rskomski@neb.rr.com
    J. Appl. Phys. 99, 08E916 (2006); http://dx.doi.org/10.1063/1.2176892
/content/aip/journal/jap/99/8/10.1063/1.2176892
http://aip.metastore.ingenta.com/content/aip/journal/jap/99/8/10.1063/1.2176892
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Predictions for the classical Heisenberg model. The figure compares the Callen and Callen results (dashed) with the corresponding exact solutions (solid). Note that the deviations from the power-law behavior are unrelated to critical fluctuations.

Image of FIG. 2.
FIG. 2.

Spin structure of transition-metal-rich RE-TM intermetallics: (a) zero temperature and (b) room temperature. The rare-earth atoms (spheres) are embedded in a transition-metal environment. The anisotropy, indicated by the thickness of the arrows, is dominated by the rare-earth atoms. Due to the relatively weak interatomic RE-TM exchange, the anisotropy breaks down well below .

Image of FIG. 3.
FIG. 3.

Violation of the Callen and Callen law in rare-earth transition metallics. The solid line describes, for example, materials such as . This illustrates the complete failure of the Callen and Callen theory.

Image of FIG. 4.
FIG. 4.

Spin structures (schematic): (a) ferromagnetism and (b) paramagnetism. This figure illustrates the physical origin of the temperature dependence of the anisotropy of magnets.

Image of FIG. 5.
FIG. 5.

Temperature dependence of second-order anisotropy constants of some magnetic compounds. Cubic and noncubic actinide magnets exhibit (Ref. 15 ).

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/content/aip/journal/jap/99/8/10.1063/1.2176892
2006-04-27
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Finite-temperature anisotropy of magnetic alloys
http://aip.metastore.ingenta.com/content/aip/journal/jap/99/8/10.1063/1.2176892
10.1063/1.2176892
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