Local structure and magnetism of L10-type FeNi alloy films with perpendicular magnetic anisotropy studied through 57Fe nuclear probes

K. Mibu, T. Kojima, M. Mizuguchi, K. Takanashi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The local structure and magnetism of FeNi alloy films prepared by alternate deposition of Fe and Ni monatomic layers, where perpendicular magnetic anisotropy has been observed, were investigated through 57Fe nuclear probes using Mössbauer spectroscopy. It was confirmed that the films are composed of L10-type ordered FeNi phase and A1-type disordered FeNi phase. For the films grown at 40-70°C, which have no perpendicular anisotropy, the A1-disordered phase is dominant, whereas for the films grown at 100-190°C, which have a stronger perpendicular anisotropy, the relative amount of the L10-ordered phase reaches 40% or more. It was clearly shown that the magnetic anisotropy of these films is strongly correlated with the local environments of Fe in the films. The results imply that if a further increase in the ratio of the L10-ordered phase is successfully achieved, one would obtain films with a stronger magnetic anisotropy applicable to perpendicular magnetic recording.

Original languageEnglish
Article number205002
JournalJournal of Physics D: Applied Physics
Volume48
Issue number20
DOIs
Publication statusPublished - 2015 May 29

Keywords

  • FeNi
  • L1 structure
  • Mössbauer spectroscopy
  • perpendicular magnetic anisotropy

ASJC Scopus subject areas

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

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