Several kinds of martensitic phases have been found in nonstoichiometric Ni/sub 2/MnGa alloys in numerous recent studies. The structural, magnetic, and mechanical properties important for a giant magnetic-field-induced strain response in these alloys are presented. Depending on the martensite crystal structure Ni-Mn-Ga alloys are able to show a really giant (about 6% or 10%) strain response in a magnetic field less than 1 T.
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Sozinov et al. (2002) studied this question.
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