Magnetic properties of Heusler type Ni2+Mn1−Ga

Abstract Ferromagnetic Heusler type Ni 2+ x Mn 1− x Ga ( x =0–0.19) alloys were made by the arc melt method. The Curie temperature, T c , and the transformation temperatures, M s , M f , A s and A f , were measured. T c decreased, while M s , M f , A s and A f increased with increase of Ni composition. The specific heat at constant pressure for x =0.16–0.19 was measured. The specific heat at constant volume was estimated. The lattice and structural transformation terms in the specific heat at constant volume and the Debye temperature were estimated.