Kinetic effects in the magnetic and magnetocaloric properties of metamagnetic Ni50Mn35In14.25B0.75

Highlights: • Direct measurements of ΔT_ad for ΔH up to 14 T of Ni₅₀Mn₃₅In_14.25B_0.75 Heusler alloy. • The magnitude and sing of ΔTad dependency on the heating/cooling rate. • Magnetic fields larger than 12 T (on cooling) results in the kinetic arrest. • The effects of the temperature and magnetic history on MCE. Ni₅₀Mn₃₅In_14.25B_0.75 is a typical representative of the family of metamagnetic In-based Heusler alloys which shows large magnetocaloric effects generated from first order magnetostructural and ferromagnetic-paramagnetic transitions. For this alloy, a study of the adiabatic temperature change ΔT_ad by a direct method and through thermomagnetic measurements in magnetic fields up to 14 T has been performed. It has been shown that the rate of heating/cooling can affect the magnitude and sign of ΔT_ad. The application of magnetic fields larger than 12 T (on cooling) results in the "kinetic arrest" of the ferromagnetic austenitic phase. The effects of the temperature and magnetic history, and kinetic effects, on ΔT_ad of these Ni-Mn-In-based Heusler alloys in high magnetic fields are discussed.