Magnetocrystalline Anisotropy in a Single-Variant Co-Ni-Al Ferromagnetic Shape Memory Alloy

Asaya Fujita, Haruhiko Morito, Takao Kudo, Kazuaki Fukamichi, Ryosuke Kainuma, Kiyohito Ishida, Katsunari Oikawa

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The single-variant state and the magnetocrystalline anisotropy in a single crystal Co41Ni32Al27 ferromagnetic shape memory alloy (FSMA) have been investigated. After applying compressive stress, the single-variant state was confirmed by optical micrograph and linear thermal expansion measurements. In the heating process for the single-variant martensite phase, the shrinkage of about 7% takes place at the reverse transformation temperature. From the magnetization curves along the c-, a-axes and the [110]M directions in the single-variant state, the c-axis is determined to be the hard axis and the magnetocrystalline anisotropy constant in the single crystal Co41Ni32Al 27β′ martensite phase is evaluated to be 3.2 × 105J/m3 at 5 K.

Original languageEnglish
Pages (from-to)2180-2183
Number of pages4
JournalMaterials Transactions
Volume44
Issue number10
DOIs
Publication statusPublished - 2003 Oct

Keywords

  • Cobalt-nickel-aluminum alloy
  • Ferromagnetic shape memory alloy
  • Magnetocrystalline anisotropy
  • Martensitic transformation
  • Single-variant

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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