Abstract
Structural transformation, microstructure and magnetocaloric effect (MCE) were investigated in melt-spun Ni 55Mn 20.6Ga 24.4 and Ni 55Mn 19.6Ga 25.4 ribbons. Magnetic and thermal studies of the ribbons revealed the occurrence of simultaneous structural and magnetic transitions near room temperature with a narrow thermal hysteresis of magnetization ≈2 K. Maximum entropy changes (Δ S M) of −9.5 and −10.4 J/kg K have been obtained at 309 K for a field change of 2 T in Ni 55Mn 20.6Ga 24.4 and Ni 55Mn 19.6Ga 25.4 ribbons, respectively. The Ni 55Mn 19.6Ga 25.4 ribbon exhibits refrigeration capacity (RC) of 47 J/kg with low average hysteresis loss (≈1.5 J/kg) at the merged structural and magnetic transition temperature.
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