High-field magnetization and magnetic phase diagram of metamagnetic shape memory alloys Ni50 xCoxMn31.5Ga18.5 ( x = 9 and 9.7)

T. Kihara, X. Xu, A. Miyake, Y. Kinoshita, M. Tokunaga, Y. Adachi, T. Kanomata

Research output: Contribution to journalArticlepeer-review


Magnetic phase diagrams of the metamagnetic shape memory alloys Ni50-xCoxMn31.5Ga18.5 (x = 9 and 9.7) were produced from high-field magnetization measurements up to 56 T. For both compounds, magnetic field induced martensitic transformations are observed at various temperatures below 300 K. Hysteresis of the field-induced transformation shows unconventional temperature dependence: it decreases with decreasing temperature after showing a peak. Magnetic susceptibility measurement, microscopy, and X-ray diffraction data suggest a model incorporating the magnetic anisotropy and Zeeman energy in two variants, which qualitatively explains the thermal and the magnetic field history dependence of the hysteresis in these alloys.

Original languageEnglish
Pages (from-to)25-29
Number of pages5
JournalScripta Materialia
Publication statusPublished - 2020 May


  • Heusler alloy
  • High magnetic field
  • Hysteresis
  • Martensitic transformation

ASJC Scopus subject areas

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

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