Magnetic properties of the ferromagnetic shape memory alloys Ni50+xMn27-xGa23 in magnetic fields

Takuo Sakon, Kohei Otsuka, Junpei Matsubayashi, Yuushi Watanabe, Hironori Nishihara, Kenta Sasaki, Satoshi Yamashita, Rie Y. Umetsu, Hiroyuki Nojiri, Takeshi Kanomata

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Thermal strain, permeability, and magnetization measurements of the ferromagnetic shape memory alloys Ni50+xMn27-xGa23 (x = 2.0, 2.5, 2.7) were performed. For x = 2.7, in which the martensite transition and the ferromagnetic transition occur at the same temperature, the martensite transition starting temperature TMs shift in magnetic fields around a zero magnetic field was estimated to be dTMs/dB = 1.1 ± 0.2 K/T, thus indicating that magnetic fields influences martensite transition. We discussed the itinerant electron magnetism of x = 2.0 and 2.5. As for x = 2.5, the M4 vs. B/M plot crosses the origin of the coordinate axis at the Curie temperature, and the plot indicates a good linear relation behavior around the Curie temperature. The result is in agreement with the theory by Takahashi, concerning itinerant electron ferromagnets.

Original languageEnglish
Pages (from-to)3715-3734
Number of pages20
JournalMaterials
Volume7
Issue number5
DOIs
Publication statusPublished - 2014

Keywords

  • Itinerant electron ferromagnet
  • Magnetic field
  • Magnetic properties
  • Magnetization
  • Shape memory alloys
  • Thermal strain

ASJC Scopus subject areas

  • Materials Science(all)

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