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

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

doi:10.1143/JPSJ.69.3485

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

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

Institute for Materials Research (IMR)

Research output: Contribution to journal › Article › peer-review

35 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 Ni_2.19Mn_0.81 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 (M_S point) of about 350 K, which coincides with the magnetic Curie temperature (T_C). 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 language	English
Pages (from-to)	3485-3488
Number of pages	4
Journal	journal of the physical society of japan
Volume	69
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.69.3485
Publication status	Published - 2000 Nov

Keywords

Magnetic field induced martensitic transformation
Neutron diffraction
NiMnGa-based alloys

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.69.3485

Cite this

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title = "Magnetic-field-induced martensitic transformation in Ni2MnGa-based alloys",

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.",

keywords = "Magnetic field induced martensitic transformation, Neutron diffraction, NiMnGa-based alloys",

author = "Kazuko Inoue and Kazuyuki Enami and Yasuo Yamaguchi and Kenji Ohoyama and Yukio Morii and Yuki Matsuoka and Kanryu Inoue",

year = "2000",

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doi = "10.1143/JPSJ.69.3485",

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T1 - Magnetic-field-induced martensitic transformation in Ni2MnGa-based alloys

AU - Inoue, Kazuko

AU - Enami, Kazuyuki

AU - Yamaguchi, Yasuo

AU - Ohoyama, Kenji

AU - Morii, Yukio

AU - Matsuoka, Yuki

AU - Inoue, Kanryu

PY - 2000/11

Y1 - 2000/11

N2 - 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.

AB - 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.

KW - Magnetic field induced martensitic transformation

KW - Neutron diffraction

KW - NiMnGa-based alloys

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