50th Annual Conference on Magnetism and Magnetic Materials
San Jose, CA
The magnetocaloric response of off-stoichiometric Ni2MnGa polycrystal and single-crystal samples with a Curie temperature coincident with the martensitic transition temperature was investigated. The direct measurement of temperature change (ΔTad) during an adiabatic transformation under a maximum field variation ΔH = 5.6×106 A/m (7 T) was performed. The polycrystalline sample shows a maximum ΔTad ≈ 1.5 K at a temperature close to the structural transition. The value of ΔTad and the 20 K span of the ΔTad peak encourage further studies of the effect of microstructure on the magnetocaloric response of Ni2MnGa.
American Institute of Physics
Sasso, C. P.; Pasquale, M.; Giudici, L.; Besseghini, S.; Villa, E.; Lewis, L. H.; Lograsso, Thomas A.; and Schlagel, Deborah L., "Magnetostructural transitions and adiabatic temperature variation in polycrystal and single-crystal Ni2MnGa alloys" (2006). Ames Laboratory Conference Papers, Posters, and Presentations. 18.