Composition dependence of magnetic and magnetothermal properties of Ni–Mn–Ga shape memory alloys

• Published in: Journal of magnetism and magnetic materials Vol. 272; pp. 2111 - 2112
• Main Authors: Albertini, F, Canepa, F, Cirafici, S, Franceschi, E.A, Napoletano, M, Paoluzi, A, Pareti, L, Solzi, M
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2004
• Subjects: Ferromagnetic-shape-memory alloy; Magnetocaloric effect; Martensitic transformation; Ni–Mn–Ga; 81.30.Kf; Magnetocaloric effect; Ni–Mn–Ga; 75.50.Cc; Martensitic transformation; 75.30.Sg; Ferromagnetic-shape-memory alloy
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2003.12.883

A simultaneous magnetic and structural transition is found for Ni
2+
x
Mn
1−
x
Ga at 0.18⩽
x⩽0.2. The existence of a composition range for observing the co-occurrent transition and the composition dependence of the critical temperatures are discussed in the light of the expected difference between the Curie temperatures of the austenitic and martensitic phases. A giant magnetic entropy change is deduced for the three samples, with a maximum value of the order of |Δ
S
m|=15
J/kg
K for a field span of 1.8
T.