ZhETF, Vol. 142,
p. 748 (October 2012)
(English translation - JETP,
Vol. 115, No. 4,
available online at www.springer.com
OPTIMIZATION OF THE MAGNETOCALORIC EFFECT IN Ni-Mn-In ALLOYS: A THEORETICAL STUDY
Sokolovskiy V.V., Buchelnikov V.D., Entel P.
Received: February 6, 2012
Based on ab initio and Monte Carlo simulations, we study the influence of the strength of the magnetic exchange parameters on the inverse and conventional magnetocaloric effect in the Ni50 Mn34 In16 Heusler alloy using the mixed Potts and Blume-Emery-Griffiths model Hamiltonian. Within the proposed model, the temperature dependences of the magnetization, tetragonal deformation, and adiabatic temperature changes for magnetic field variation are obtained. It is first shown that a decrease in the magnetic exchange interactions leads to increased values of the magnetocaloric effect. We suppose that a reduction of the exchange interactions in the Ni-Mn-In alloy can be realized by the doping with nonmagnetic atoms such as B, Si, Zn, Cu, etc.