Ferromagnetic shape memory alloys (FSMA) are capable of producing, magnetically induced strain of several percent at frequencies of the order of 1 kHz. The best performance exhibit alloys based on the Ni-Mn-Ga system. Off-stoichiometric single crystals of Ni₂MnGa phase can produce up to 10% strain in the field below 1T.
In this study the Ni₄₉Mn₂₉Ga₂₁ alloy was prepared by arc melting of the pure elements followed by the modified Bridgman growth method. Structure and phase transition temperatures were studied. The X-ray diffraction patterns as well as magnetic measurements and SEM observations revealed a presence of martensite at room temperature. The magnetization vs. temperature curve showed the martensite-to-austenite transformation starting at 290K and the Curie temperature at 390K.
The effect of thermal treatment on the structure was investigated.

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