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We have fabricated single roller melt-spun ribbons of the ferromagnetic shape memory alloy NiMnGa. The ribbons' magnetic and magnetoelastic responses and corresponding microstructure in the as-spun and annealed states were analyzed by a combination of vibrating sample magnetometry, X-ray diffraction, differential scanning calorimetery, capacitance dilatometry, and optical microscopy. The transformation strain in the annealed ribbons showed a dependence on the applied field of 600 ppm, whereas the as-spun samples did not display any field-induced strain.
Date of Publication: Jan. 2006