MONTE CARLO STUDY OF MAGNETOCALORIC EFFECT OF HEUSLER SHAPE MEMORY Ni-Mn-X (X= In, Sn) ALLOYS

摘要

In this work we present a theoretical model for investigate of the magnetocaloric effects and magnetic properties of the Heusler Ni_(50)Mn_(25+x)X_(25-x) (X=In, Sn) alloys by the Monte Carlo method. The temperature dependences of the magnetization, tetragonal deformation, heat capacity, positive and negative isothermal magnetic entropy changes for magnetic field variation at the structural and magnetic phase transitions are obtained. All quantities are in qualitatively agreement with the available experimental data.