Journal or Book Title
Physical Review B
A first order transition from a paramagnetic-austenite phase to a ferromagnetic-martensite phase occurring in off-stoichiometry single crystals of Ni2MnGa at 313 K presents unique features due to the multifunctional character of the magnetic shape memory alloy. A remarkable magnetocaloric effect, associated with an entropy change up to ΔS≈−86 J kg−1 K−1 and an adiabatic temperature change ΔT≈2.2 K, accompanied by mechanical strain Δε⩾3% have been observed in samples subjected to changes of the applied magnetic field ΔH=4×106 A∕m (≈5 T). The effects of magnetic field, temperature, and stress on the entropy variationΔS are quantified and compared.
American Physical Society
Pasquale, M.; Sasso, C. P.; Lewis, L. H.; Giudici, L.; Lograsso, Thomas A.; and Schlagel, Deborah L., "Magnetostructural transition and magnetocaloric effect in Ni55Mn20Ga25 single crystals" (2005). Ames Laboratory Publications. 99.