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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
Volume 43, Issue 12, Pages 8036-8039Publisher
INST PURE APPLIED PHYSICS
DOI: 10.1143/JJAP.43.8036
Keywords
MnCoGe; structural transformation; ferromagnetic shape memory; powder X-ray diffraction; high fields
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The structural transformation of a ferromagnetic Mn1.07CO0.92Ge 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 Mn1.07Co0.92Ge at the vicinity of Ms.
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