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The metastability of the nonstoichiometric Ni51Mn33.4In15.6Heusler alloy in the first-order transition region is studied using direct adiabatic temperature change (ΔTad) measurements for heating and cooling magnetization processes. During the heating process, ΔTadshows an unusual pronounced peak at 294 K in low applied magnetic fields. The height of this peak diminishes and eventually vanishes at higher fields. Kinks are as well observed in the 290-295 K temperature interval for both processes. The existence of the peak and kinks is indicative of the complex magnetic dynamics in Ni51Mn33.4In15.6and is attributed to a spin-reorientation transition near the first-order phase transition temperature.
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Seyoum et al. (2013) studied this question.
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