The effect of pressure on the magnetic and structural transition temperatures of the shape memory alloys Ni50+x(Mn0.5Fe0.5)25Ga25-x

Y. Adachi, M. Kato, T. Kanomata, D. Kikuchi, X. Xu, R. Y. Umetsu, R. Kainuma, K. R.A. Ziebeck

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Abstract

Abstract The effect of pressure on the Curie temperature TC and the martensitic transition temperature TM of the ferromagnetic shape memory alloys Ni50+x(Mn0.5Fe0.5)25Ga25-x has been investigated by measuring the temperature dependence of the initial permeability at various pressures up to ~10 kbar. The pressure derivatives of TC and TM, dTC/dp and dTM/dp, of Ni50(Mn0.5Fe0.5)25Ga25 (x=0) are found to be 0.23 K/kbar and 0.77 K/kbar, respectively. The values of dTC/dp and dTM/dp of Ni50+x(Mn0.5Fe0.5)25Ga25-x alloys decrease with increasing x. Moreover the sign of dTC/dp changes from positive to negative with increasing x. The pressure dependence of TC for Ni50+x(Mn0.5Fe0.5)25Ga25-x alloys is discussed qualitatively based on the dependence of the exchange interactions on interatomic distance.

Original languageEnglish
Article number308895
Pages (from-to)83-87
Number of pages5
JournalPhysica B: Condensed Matter
Volume464
DOIs
Publication statusPublished - 2015 May 1

Keywords

  • Curie temperature
  • Martensitic transition temperature
  • Pressure effect
  • Shape memory alloy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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