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Giant magnetic-field-induced strain in NiMnGa seven-layered martensitic phase

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4 Author(s)
Sozinov, A. ; Helsinki University of Technology, P.O. Box 6200, FIN-02015 HUT, Finland ; Likhachev, A.A. ; Lanska, N. ; Ullakko, K.

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Giant magnetic-field-induced strain of about 9.5% was observed at ambient temperature in a magnetic field of less than 1 T in NiMnGa orthorhombic seven-layered martensitic phase. The strain proved to be caused by magnetic-field-controlled twin boundary motion. According to an analysis of x-ray diffraction data, the crystal structure of this phase is nearly orthorhombic, having lattice parameters a=0.619 nm, b=0.580 nm, and c=0.553 nm (in cubic parent phase coordinates) at ambient temperature. Seven-layer shuffling-type modulation along the (110)[11¯0]p system was recorded. The results of mechanical tests and magnetic anisotropy property measurements are also reported. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:80 ,  Issue: 10 )