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Magnetic field-controlled two-way shape memory in CoNiGa single crystals
APPLIED PHYSICS LETTERS, 2004, 84 (18): 3594～3596，-0001，（）：
A two-way magnetic field controlled shape memory effect has been observed in single crystals of CoNiGa with martensitic transformation temperature ranging from 205 to 341K. Two-way shape memory with -2.3% strain has been obtained in free samples. By applying a bias field of up to 2T, the shape memory strain can be continuously controlled from negative 2.3% to positive 2.2% giving it a total strain of 4.5%. The magnetic properties of CoNiGa show that it is a good shape memory material working at relatively high temperature of up to 450K, and has a lower magnetic anisotropy than NiMnGa.
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