Magnetic-field-induced transformation in FeMnGa alloys

A kind of ferromagnetic shape memory alloy with off-stoichiometric composition of Heusler alloy Fe 2 MnGa has been synthesized. By optimizing composition, the martensitic transformation has been modified to occur at about 163 K accompanying spontaneous magnetization, which enables a magnetic field-i...

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Bibliographic Details
Published in:Applied physics letters 2009-11, Vol.95 (22), p.222512-222512-3
Main Authors: Zhu, W., Liu, E. K., Feng, L., Tang, X. D., Chen, J. L., Wu, G. H., Liu, H. Y., Meng, F. B., Luo, H. Z.
Format: Article
Language:English
Subjects:
ELECTRONIC STRUCTURE
FERROMAGNETIC MATERIALS
GALLIUM ALLOYS
HEUSLER ALLOYS
MAGNETIC FIELDS
MAGNETIZATION
MARTENSITE
MATERIALS SCIENCE
PARAMAGNETISM
PHASE TRANSFORMATIONS
SHAPE MEMORY EFFECT
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
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Summary:A kind of ferromagnetic shape memory alloy with off-stoichiometric composition of Heusler alloy Fe 2 MnGa has been synthesized. By optimizing composition, the martensitic transformation has been modified to occur at about 163 K accompanying spontaneous magnetization, which enables a magnetic field-induced structural transition from a paramagnetic parent phase to a ferromagnetic martensite with high magnetization of 93.8 emu/g. The material performs a quite large lattice distortion through the transformation, ( c − a ) / c = 33.5 % , causing a shape memory strain upto 3.6%. Such large lattice distortions strongly influence the electron structures, and thus some special physical behavior related to the transport and conductive properties is investigated.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3269590