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The magnetocaloric e ect may be assessed indirectly by expressing it as the change in magnetic entropy in varying magnetic eld, H, as the function of temperature, T . Magnetization, M = f(T,H), may be experimentally acquired from a series of isothermal measurements with variable eld, or from a series of constant eld measurements with variable temperature. The accuracy of magnetic entropy calculation depends on the number of series in these experiments. The aim of this work is to determine how little data is su cient to obtain accurate results of magnetic entropy change calculations, on the basis of real, magnetocaloric materials. Pure gadolinium and a Ni Mn Cu Ga Heusler alloy were studied. For both materials, the magnetic entropy change and relative cooling power were calculated from both experiments, with the decreasing number of experimental data. For both materials, the constant eld experiment with only 6 eld values provided only a 5% error of calculations, as compared to the experiment with 100 eld values. The Arrott plots were also drawn for constant eld mode with 6 eld values, easily indicating the order of transition. Comparison of the calculation results suggests that the constant eld mode magnetization measurement may be more accurate and faster than isothermal mode.

Entropy Change Calculations for Pure Gd and a Ni-Mn-Cu-Ga Heusler Alloy: Constant Field vs. Constant Temperature Experiment