Phase diagram of the ferromagnetic shape memory alloys Ni 2MnGa 1-xCo x

T. Kanomata, S. Nunoki, K. Endo, M. Kataoka, H. Nishihara, V. V. Khovaylo, R. Y. Umetsu, T. Shishido, M. Nagasako, R. Kainuma, K. R.A. Ziebeck

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18 Citations (Scopus)

Abstract

Permeability, magnetization, and differential scanning calorimetry measurements are carried out on the ferromagnetic shape memory alloys Ni 2MnGa 1-xCo x (0≤x≤ 0.20). On the basis of the experimental results, the phase diagram in the temperature-concentration plane is determined. The determined phase diagram is spanned by a paramagnetic austenite (Para-A) phase, paramagnetic martensite phase, ferromagnetic austenite phase, ferromagnetic martensite (Ferro-M) phase, and a premartensite phase. The measurements show that a magnetostructural transition between the Para-A and Ferro-M phases does not appear in this alloy system. The phase diagram is discussed using phenomenological Landau theory.

Original languageEnglish
Article number134421
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number13
DOIs
Publication statusPublished - 2012 Apr 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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