Field-induced martensitic transformation in new ferromagnetic shape memory compound Mn1.07Co0.92Ge

Keiichi Koyama; Masanari Sakai; Takeshi Kanomata; Kazuo Watanabe

doi:10.1143/JJAP.43.8036

Field-induced martensitic transformation in new ferromagnetic shape memory compound Mn_1.07Co_0.92Ge

Keiichi Koyama, Masanari Sakai, Takeshi Kanomata, Kazuo Watanabe

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

121 Citations (Scopus)

Abstract

The structural transformation of a ferromagnetic Mn_1.07Co _0.92Ge compound was studied by magnetization measurement in magnetic fields up to 13 T and powder X-ray diffraction measurement in fields up to 5 T. The Curie temperature is determined to be 275 K. At room temperature, the compound has a hexagonal Ni₂In-type structure, and it transforms diffusionlessly into an orthorhombic TiNiSi-type structure at M_S = 210 K with hysteresis. The cell volume expands by 5.3% and the magnetic moment increases by 24% at M_S, accompanied with this martensitic structural transformation. In addition, we confirmed for the first time that magnetic field induces the structural transformation in Mn_1.07Co _0.92Ge at the vicinity of M_S.

Original language	English
Pages (from-to)	8036-8039
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	43
Issue number	12
DOIs	https://doi.org/10.1143/JJAP.43.8036
Publication status	Published - 2004 Dec
Externally published	Yes

Keywords

Ferromagnetic shape memory
High fields
MnCoGe
Powder X-ray diffraction
Structural transformation

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.43.8036

Cite this

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title = "Field-induced martensitic transformation in new ferromagnetic shape memory compound Mn1.07Co0.92Ge",

abstract = "The structural transformation of a ferromagnetic Mn1.07Co 0.92Ge compound was studied by magnetization measurement in magnetic fields up to 13 T and powder X-ray diffraction measurement in fields up to 5 T. The Curie temperature is determined to be 275 K. At room temperature, the compound has a hexagonal Ni2In-type structure, and it transforms diffusionlessly into an orthorhombic TiNiSi-type structure at MS = 210 K with hysteresis. The cell volume expands by 5.3% and the magnetic moment increases by 24% at MS, accompanied with this martensitic structural transformation. In addition, we confirmed for the first time that magnetic field induces the structural transformation in Mn1.07Co 0.92Ge at the vicinity of MS.",

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AU - Koyama, Keiichi

AU - Sakai, Masanari

AU - Kanomata, Takeshi

AU - Watanabe, Kazuo

PY - 2004/12

Y1 - 2004/12

N2 - The structural transformation of a ferromagnetic Mn1.07Co 0.92Ge compound was studied by magnetization measurement in magnetic fields up to 13 T and powder X-ray diffraction measurement in fields up to 5 T. The Curie temperature is determined to be 275 K. At room temperature, the compound has a hexagonal Ni2In-type structure, and it transforms diffusionlessly into an orthorhombic TiNiSi-type structure at MS = 210 K with hysteresis. The cell volume expands by 5.3% and the magnetic moment increases by 24% at MS, accompanied with this martensitic structural transformation. In addition, we confirmed for the first time that magnetic field induces the structural transformation in Mn1.07Co 0.92Ge at the vicinity of MS.

AB - The structural transformation of a ferromagnetic Mn1.07Co 0.92Ge compound was studied by magnetization measurement in magnetic fields up to 13 T and powder X-ray diffraction measurement in fields up to 5 T. The Curie temperature is determined to be 275 K. At room temperature, the compound has a hexagonal Ni2In-type structure, and it transforms diffusionlessly into an orthorhombic TiNiSi-type structure at MS = 210 K with hysteresis. The cell volume expands by 5.3% and the magnetic moment increases by 24% at MS, accompanied with this martensitic structural transformation. In addition, we confirmed for the first time that magnetic field induces the structural transformation in Mn1.07Co 0.92Ge at the vicinity of MS.

KW - Ferromagnetic shape memory

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KW - MnCoGe

KW - Powder X-ray diffraction

KW - Structural transformation

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