Fe-Ni composition dependence of magnetic anisotropy in artificially fabricated L10-ordered FeNi films

Takayuki Kojima, Misako Ogiwara, Masaki Mizuguchi, Masato Kotsugi, Tomoyuki Koganezawa, Takumi Ohtsuki, Taka Yuki Tashiro, Koki Takanashi

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

We prepared L10-ordered FeNi alloy films by alternate deposition of Fe and Ni monatomic layers, and investigated their magnetic anisotropy. We employed a non-ferromagnetic Au-Cu-Ni buffer layer with a flat surface and good lattice matching to L10-FeNi. An L10-FeNi film grown on Au6Cu51Ni43 showed a large uniaxial magnetic anisotropy energy (Ku = 7.0 × 106 erg cm -3). Ku monotonically increased with the long-range order parameter (S) of the L10 phase. We investigated the Fe-Ni composition dependence by alternating the deposition of Fe 1 - x and Ni 1 + x monatomic layers (- 0.4 < x < 0.4). Saturation magnetization (Ms) and Ku showed maxima (Ms = 1470 emu cm-3, K u = 9.3 × 106 erg cm-3) for Fe 60Ni40 (x = -0.2) while S showed a maximum at the stoichiometric composition (x = 0). The change in the ratio of lattice parameters (c/a) was small for all compositions. We found that enrichment of Fe is very effective to enhance Ku. The large Ms and K u of Fe60Ni40 indicate that Fe-rich L1 0-FeNi is promising as a rare-earth-free permanent magnet.

Original languageEnglish
Article number064207
JournalJournal of Physics Condensed Matter
Volume26
Issue number6
DOIs
Publication statusPublished - 2014 Feb 12

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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