Giant magnetocaloric effect of compressible Ising and Heisenberg lattices

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abstract

Since the discovery of giant magnetocaloric materials, it has become clear that magnetovolume coupling can lead to a large increase to a material's magnetocaloric effect, and so, to high-performance magnetic refrigerants. A simple and computationally inexpensive approach to gauge magnetovolume effects is via the Bean-Rodbell model, where a Curie temperature dependence on volume is included in the Weiss mean-field model. The thermodynamic properties of giant magnetocaloric materials are described, namely discontinuous magnetization curves and large entropy change values. Moving to a microscopic model is a natural step to better characterize giant magnetocaloric materials. In this work we show how an Ising/Heisenberg-type interaction together with elastic/magnetovolume coupling can be solved by a Monte-Carlo method, reproducing the thermodynamic properties of giant magnetocaloric systems. The low computational cost of this approach and the possibilities of simulating systems using Density Functional Theory calculated magnetic interaction parameters allow the computational study and design of (giant) magnetocaloric materials.

authors

J. S. Amaral, N. M. Fortunato, C. O. Amorim, J. N. Gonçalves, V. S. Amaral

our authors

foto João Nuno Santos Gonçalves

João Nuno Santos Gonçalves

Junior Researcher

Groups

G2 - Photonic, Electronic and Magnetic Materials

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Publication Details

type
Journal Article
year
2016
journal
Refrigeration Science and Technology Proceedings
digital object identifier
10.18462/iir.thermag.2016.0200

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