Artículo
Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model
Autor/es | Moreno Ramírez, Luis Miguel
Franco García, Victorino |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2021 |
Fecha de depósito | 2021-06-30 |
Publicado en |
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Resumen | The applicability of magnetocaloric materials is limited by irreversibility. In this work, we evaluate the reversible magnetocaloric response associated with magnetoelastic transitions in the framework of the Bean-Rodbell ... The applicability of magnetocaloric materials is limited by irreversibility. In this work, we evaluate the reversible magnetocaloric response associated with magnetoelastic transitions in the framework of the Bean-Rodbell model. This model allows the description of both second- and first-order magnetoelastic transitions by the modification of the η parameter (η<1 for second-order and η>1 for first-order ones). The response is quantified via the Temperature-averaged Entropy Change (TEC), which has been shown to be an easy and effective figure of merit for magnetocaloric materials. A strong magnetic field dependence of TEC is found for first-order transitions, having a significant increase when the magnetic field is large enough to overcome the thermal hysteresis of the material observed at zero field. This field value, as well as the magnetic field evolution of the transition temperature, strongly depend on the atomic magnetic moment of the material. For a moderate magnetic field change of 2 T, first-order transitions with η≈1.3−1.8 have better TEC than those corresponding to stronger first-order transitions and even second-order ones. |
Agencias financiadoras | Agencia Estatal de Investigación. España PID2019-105720RB-I00 |
Identificador del proyecto | PID2019-105720RB-I00
US-1260179 P18-RT-746 W911NF1920212 |
Cita | Moreno Ramírez, L.M. y Franco García, V. (2021). Reversibility of the Magnetocaloric Effect in the Bean-Rodbell Model. Magnetochemistry, 7 (5), 60. |
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