Abstract
► High-speed imaging system in pulsed magnetic field was developed. ► The phase diagram of Ni 45 Co 5 Mn 36.7 Al 13.3 was determined by the optical images. ► Magneto-caloric effect measurement system in pulsed magnetic field was developed. ► Magneto-caloric effect of Gd was consistent with the estimation from specific heat. ► Gigantic adiabatic heating larger than 60 K in Gd was observed. As novel tools to study magnetic shape memory alloys, a high-speed optical microscope system and a measurement system of magnetocaloric effects (MCEs) in pulsed magnetic fields are developed. Using the high-speed imaging system, successive changes in the surface morphology are visualized in the process of magnetic field-induced reverse martensitic transformation in Ni 45 Co 5 Mn 36.7 In 13.3 . The MCEs of Gd studied in pulsed fields show reasonable agreement with the earlier results obtained in steady fields. Application of high magnetic fields up to 55 T realizes a gigantic adiabatic heating of 63 K.
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