Shape memory and ferromagnetic shape memory effects in single-crystal Ni 2 MnGa thin films Heusler alloy Mn 2 NiGa has been developed by synthesizing a series of ferromagnetic shape memory alloys Mn 25+x Ni 50−x Ga 25 ͑x = 0-25͒. Mn 2 NiGa exhibits a martensitic transformation around room temperature with a large thermal hysteresis up to 50 K and a lattice distortion as large as 21.3% and has a quite high Curie temperature of 588 K. The martensite shows a high-saturated field up to 2 T. The excellent two-way shape memory behavior with a strain of 1.7% was observed in the single crystal Mn 2 NiGa. The magnetic-field-controlled effect created a total strain up to 4.0% and changed the sign of the shape deformation effectively.