Magnetic-Field-Induced Martensitic Transformation in Ni_2MnGa-Based Alloys : Condensed Matter: Structure, etc.

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概要

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• 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 Ni_2.19Mn_0.81Ga alloy under the magnetic field of up t,o 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.

• 社団法人日本物理学会の論文
• 2000-11-15

著者

• Ohoyama K

  Institute For Materials Research Tohoku University

• Ohoyama Kenji

  Department Of Physics Faculty Of Science Tohoku University

• YAMAGUCHI Yasuo

  IMR, Tohoku University

• YAMAGUCHI Yasuo

  Institute for Materials Research, Tohoku University

• Ohyama Kenji

  Imr Tohoku University

• INOUE Kazuko

  Faculty of Science and Technology, Ryukoku University

• ENAMI Kazuyuki

  Faculty of Science and Technology, Ryukoku University

• OHOYAMA Kenji

  IMR, Tohoku University

• MORII Yukio

  Japan Atomic Energy Research Institute

• MATSUOKA Yuki

  Japan Atomic Energy Research Institute

• INOUE Kanryu

  Materials Science and Technology, University of Washington

• Yamaguchi Y

  Tohoku Univ. Sendai

• Yamaguchi Y

  Kumamoto Techno Res. Park Kumamoto Jpn

• Inoue K

  Technol. Res. Inst. Osaka Prefecture Osaka Jpn

• Morii Y

  Japan Atomic Energy Res. Inst. Ibaraki Jpn

• Morii Y

  Jaeri Tokai

• Morii Yukio

  Advanced Science Research Center Japan Atomic Energy Research Inst.

• Morii Yukio

  Department Of Physics Japan Atomic Energy Research Institute

• Morii Yukio

  Japan Atomic Energy Research Inst.

• Morii Yukio

  Tokai Establishment Japan Atomic Energy Research Institute

• Inoue K

  Dept. Of Mechanical And System Engineering Ryukoku Univ.

• Inoue Kanryu

  Materials Science And Engineering University Of Washington

• Oikawa K

  Inst. Materials Structure Sci. Ibaraki

• Enami K

  Ryukoku Univ. Otsu Jpn

• Inoue Kazuko

  Faculty Of Science And Technology Ryukoku University

• Iga K

  Microsystem Research Center P & I Lab . Tokyo Institute Of Technology

• Yamaguchi Y

  Central Workshop Osaka University

• Morii Yukio

  Neutron Scattering Laboratory Japan Atomic Energy Research Institute Tokai

• Inoue Kazuko

  Faculty Of Pharmaceutical Sciences Okayama University

• Iga K

  Precision & Intelligence Laboratory Tokyo Institute Of Technology

• Morii Yukio

  Neutron Scattering Laboratory Japan Atomic Energy Research Insts

• Matsuoka Yuki

  Japan Atomic Energy Research Institute:(present)fac. Of Sci. Nara Women's Univ.

• Morii Yukio

  Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan

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