Análise do comportamento magnético dos compostos TbxPr(1-x)Al2 via simulação numérica

Abstract

In this work, the intermetallic compounds TbxPr1-xAl2, with x = 0,1, 0,2, 0,25, 0,3, 0,5 e 0,75, were analyzed via numerical simulations of relevant physical properties, in this case, magnetization and specific heat. For the development of these simulations, the software Mathematica was used. Materials from these families have a magnetocaloric effect, an effect that has aroused interest due to the potential application, among others, as an alternative in refrigeration. In addition to these applications, there is also interest in ferrimagnetic materials for use as magnetic sensors and information storage technology. In this study, data from previously produced and characterized samples were analyzed and compared with the results of numerical simulations using theoretical models developed and available in the specialized literature, in particular the molecular field (or medium field) theory. From this, and considering several known properties of the compounds RAl2, where R is a rare earth element, it was assumed that the parameters of molecular, inter-network and crystalline field exhibit linear behavior. This allowed to obtain satisfactory results in agreement with the experimental data. In this way, the efficiency of the simulation and of the medium field approach was evidenced, also confirming the fact that several physical properties and parameters of the RAl2 family of compounds have linear behavior depending on the rare earth element involved. Finally, it was possible to perform analyzes and better understand some of the physical properties presented by the materials explored here and their derivations.