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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Soft Magnetic Materials

J. Appl. Phys. 111, 07A310 (2012); http://dx.doi.org/10.1063/1.3671436 (3 pages)

Magnetocrystalline anisotropy in FePt with L10 ordering and tetragonal distortion

Yohei Kota and Akimasa Sakuma

Department of Applied Physics, Tohoku University, Aoba 6-6-05, Aoba-ku, Sendai 980-8579, Japan

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(Received 17 September 2011; accepted 19 October 2011; published online 14 February 2012)

We evaluate the magnetocrystalline anisotropy energy of L10 type FePt alloys with the lattice distortion and atomic disorder by using the first-principles calculation, which adopts the tight-binding linear muffin-tin orbital method in conjunction with the coherent potential approximation techniques. The calculated result indicates that the magnetocrystalline anisotropy energy is quite sensitive to the mentioned factors. In particular, it is drastically decreased with the degree of ordering compared with the expected value from the completely ordered structure. We will suggest that the improvement of the chemical ordering of the L10 crystal is one of the significant points to obtain a large magnetocrystalline anisotropy from FePt compounds.

© 2012 American Institute of Physics

KEYWORDS, PACS, and IPC

Keywords

ab initio calculations, CPA calculations, energy gap, iron alloys, linear muffin-tin orbital method, magnetic anisotropy, platinum alloys, tight-binding calculations

PACS

  • 75.30.Gw

    Magnetic anisotropy

  • 75.40.Mg

    Numerical simulation studies

  • 71.15.Ap

    Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)

  • 71.20.Be

    Transition metals and alloys

International Patent Classification (IPC)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3671436

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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