Artículo
Influence of the demagnetizing factor on the magnetocaloric effect: Critical scaling and numerical simulations
Autor/es | Romero-Muñiz, Carlos
Ipus Bados, Jhon Jairo Blázquez Gámez, Javier Sebastián Franco García, Victorino Conde Amiano, Alejandro |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2014 |
Fecha de depósito | 2016-01-29 |
Publicado en |
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Resumen | In recent years, the magnetocaloric effect is studied not only for the search of potential magnetic
refrigerant materials but also for the analysis of critical phenomena. In both cases, the
demagnetizing field might have ... In recent years, the magnetocaloric effect is studied not only for the search of potential magnetic refrigerant materials but also for the analysis of critical phenomena. In both cases, the demagnetizing field might have a notable influence on the results. In this work, we carry out a systematic study, based on theoretical simulations, of the influence of the demagnetizing factor on the magnetocaloric properties. On the one hand, we show that demagnetizing factor affects only slightly the magnetic entropy change ( D S M ), reducing its magnitude and shifting the peak to higher temperatures. On the other hand, it dramatically affects the exponent n of field dependence ð D S M / H n Þ at temperatures below the peak. We demonstrate that scaling of the magnetocaloric curves can be used to remove the influence of the demagnetizing field and, to which extent, critical exponent determination can be affected. Results of numerical simulations are compared with experimental data from a ball milled powder alloy. |
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