Magnetic-field-induced martensitic transformation in Ni2MnGa-based alloys

Kazuko Inoue, Kazuyuki Enami, Yasuo Yamaguchi, Kenji Ohoyama, Yukio Morii, Yuki Matsuoka, Kanryu Inoue

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The magnetic controllability of the thermoelastic martensitic transformation, which is the origin of the shape-memory effect, has been investigated. We have carried out neutron diffraction measurements of a Heusler-type off-stoichiometric Ni2.19Mn0.81 Ga alloy under the magnetic field of up to 5 T using the HERMES and the TAS-2 diffractometers both installed at the JRR-3M reactor of Japan Atomic Energy Research Institute (JAERI). This alloy has the martensitic transformation temperature (MS point) of about 350 K, which coincides with the magnetic Curie temperature (TC). It is ferromagnetic in the martensitic phase and paramagnetic in the cubic Heusler phase. By Rietveld analysis of the diffraction patterns we have confirmed that the martensitic phase and the cubic phase coexist at 350 K. We have also discovered that half of the cubic phase changes to martensitic phase under the magnetic field of 5 T at this temperature. This finding indicates the possibility of controlling the martensitic transformation by means of the external magnetic field.

Original languageEnglish
Pages (from-to)3485-3488
Number of pages4
Journaljournal of the physical society of japan
Volume69
Issue number11
DOIs
Publication statusPublished - 2000 Nov

Keywords

  • Magnetic field induced martensitic transformation
  • Neutron diffraction
  • NiMnGa-based alloys

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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