Tetragonally distorted structure and uniaxial magnetic anisotropy of Fe100-xCox/Rh/MgO epitaxial films

H. Oomiya, B. Wang, S. Yoshida, T. Kataguchi, K. Takahashi, S. Kanatani, L. Zhang, L. Liu, T. Hasegawa, K. Hayasaka, S. Saito, N. Inami, T. Ueno, K. Ono, S. Ishio

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9 Citations (Scopus)

Abstract

The uniaxial magnetic anisotropy of tetragonally distorted Fe100-xCox epitaxial films prepared using Rh buffer on a MgO substrate was investigated. The structural relation of body-centered cubic FeCo (002)[1 1 0] //Rh(0 0 2)[1 0 0] //MgO(0 0 1)[1 0 0] was maintained up to 20 nm FeCo thickness. The uniaxial magnetic anisotropy constant (K u1) of the Fe50Co50 films reached a maximum of 1.6 × 107 erg cm-3 when the c/a ratio was 1.15-1.25. The composition dependence of K u1 of Fe100-xCox (t FeCo = 1.5 nm) was at a maximum at Fe50Co50. These results agree qualitatively with the theoretical value for FeCo films with a tetragonal distortion (c/a = 1.25) and without B2 chemical ordering. Additional uniaxial magnetic anisotropy observed at c/a 1.1 is attributable to the B2 ordering, in addition to the tetragonal distortion.

Original languageEnglish
Article number475003
JournalJournal of Physics D: Applied Physics
Volume48
Issue number47
DOIs
Publication statusPublished - 2015 Nov 2

Keywords

  • FeCo
  • Uniaxial magnetic anisotropy
  • epitaxial films
  • tetragonal distortion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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