Journal of the Korean Physical Society

, Volume 63, Issue 3, pp 733–738 | Cite as

Effects of film composition and substrate orientation on the structure and the magnetic properties of Fe-Co-B alloy films formed on MgO single-crystal substrates

  • Yugo Asai
  • Mitsuru Ohtake
  • Tetsuroh Kawai
  • Masaaki Futamoto
Article

Abstract

(Fe0.7Co0.3)100−xBx alloy thin films are prepared on MgO single-crystal substrates with (100), (110), and (111) orientations at 200C by ultra-high vacuum radio-frequency magnetron sputtering with various B compositions, x, from 0 to 15 at.%. The effects of composition and substrate orientation on the structure and the magnetic properties are studied. Fe-Co epitaxial films with bcc structures are obtained on all substrates. Fe-Co(100) single-crystal films are formed on MgO(100) substrates. Fe-Co films epitaxially grown on MgO(110) substrates consist of two (211) variants whose orientations are rotated around the film’s normal by 180 each other. Fe-Co(110) films grow epitaxially on MgO(111) substrates with two types of variants, Nishiyama-Wasserman and Kurdjumov-Sachs relationships. As the B composition increases up to around 5 at.%, the film involves an amorphous structure in addition to an epitaxial bcc crystal structure. With further increases in the B content, the film is only amorphous. The magnetization properties of the films involving epitaxial crystals reflect the magnetocrystalline anisotropy of the bulk Fe-Co crystal. The easy magnetization direction varies depending on the crystallographic orientation of the film. Isotropic in-plane magnetic properties are observed for amorphous films.

Keywords

Fe-Co Fe-Co-B Thin film Epitaxial growth Single-crystal substrate MgO 

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References

  1. [1]
    W. H. Butler, X.-G. Zhang, T. C. Schulthess and J. M. MacLaren, Phys. Rev. B 63, 054416 (2001).ADSCrossRefGoogle Scholar
  2. [2]
    J. Mathon and A. Umerski, Phys. Rev. B 63, 220403 (2001).ADSCrossRefGoogle Scholar
  3. [3]
    M. Ohtake, T. Nishiyama, K. Shikada, F. Kirino and M. Futamoto, J. Magn. Magn. Mater. 322, 1947 (2010).ADSCrossRefGoogle Scholar
  4. [4]
    G. Wasserman, Arch. Eisenhuettenwes 16, 647 (1933).Google Scholar
  5. [5]
    Z. Nishiyama, Sci. Rep. Tohoku Univ. 23, 638 (1934).Google Scholar
  6. [6]
    G. Kurdjimov and G. Sachs, Z. Phys. 64, 325 (1930).ADSCrossRefGoogle Scholar

Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Yugo Asai
    • 1
  • Mitsuru Ohtake
    • 1
  • Tetsuroh Kawai
    • 1
  • Masaaki Futamoto
    • 1
  1. 1.Faculty of Science and EngineeringChuo UniversityTokyoJapan

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