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

Sozinov, A.; Likhachev, A. A.; Lanska, N.; Ullakko, K.
March 2002
Applied Physics Letters;3/11/2002, Vol. 80 Issue 10, p1746
Academic Journal
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][sub 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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