Magnetic properties and phase diagram of Ni50Mn 50-xGax ferromagnetic shape memory alloys

Xiao Xu, Makoto Nagasako, Wataru Ito, Rie Y. Umetsu, Takeshi Kanomata, Ryosuke Kainuma

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present the magnetic properties and the magnetic phase diagram of Ni50Mn50-xGax ferromagnetic shape memory alloys across a wide concentration range. Martensitic transformation, intermediate transformation, B2-L21 order-disorder transformation, Néel and Curie temperatures are determined for the prepared samples. The martensitic transformation temperature decreases with increasing Ga concentration and bends two times when crossing the Curie temperature and the intermediate-phase transformation temperature. Spontaneous magnetization and its composition dependence were also investigated. Composition dependence of the transformation temperatures and the spontaneous magnetization in the martensite phase of Ni50Mn50-xGax are compared with those of Ni50Mn50-xInx and Ni50Mn 50-xSnx, revealing a similarity in the NiMn-based alloy systems.

Original languageEnglish
Pages (from-to)6712-6723
Number of pages12
JournalActa Materialia
Volume61
Issue number18
DOIs
Publication statusPublished - 2013 Oct 1

Keywords

  • Ferromagnetic shape memory alloys
  • Martensitic transformation
  • Ni MnGa
  • Phase diagram
  • Saturation magnetization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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