Phase transitions

Analysis of magnetocaloric effect in ferromagnetic shape memory alloy crystals

G. A. Malygin

Ioffe Institute, St. Petersburg, Russia

Abstract: In the framework of the theory of diffuse martensitic transitions to be based on thermodynamic and kinetic relationships the mechanism of the magnetocaloric (MC) effect in shape memory ferromagnetic alloy crystals is theoretically analysed. The theory adequately describes magnetostructural transformations and MC effect in these crystals at adiabatically applying to them and eliminating from magnetic field. The analysis also includes magneto-anisotropic crystals how to be according to literature data crystals Ni$_{49.5}$Mn$_{25.4}$Ga$_{25}$ alloy.

Keywords: magnetocaloric effect, magnetostructural martensite transitions, magneto-anisotropic crystals, isothermal entropy change.

Received: 20.12.2021
Revised: 20.12.2021
Accepted: 21.12.2021

DOI: 10.21883/FTT.2022.05.52339.258

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