Artículo
Field dependence of the magnetocaloric effect in materials with a second order phase transition: A master curve for the magnetic entropy change
Autor/es | Conde Amiano, Alejandro
Blázquez Gámez, Javier Sebastián Franco García, Victorino |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2006 |
Fecha de depósito | 2016-01-26 |
Publicado en |
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Resumen | The field dependence of the magnetic entropy change can be expressed as SM Hn. For soft
magnetic amorphous alloys n=1 well below the Curie temperature TC , n=2 in the paramagnetic
range, and n 0.75 for T=TC. The first ... The field dependence of the magnetic entropy change can be expressed as SM Hn. For soft magnetic amorphous alloys n=1 well below the Curie temperature TC , n=2 in the paramagnetic range, and n 0.75 for T=TC. The first value can be explained with simple arguments, n=2 is a consequence of the Curie-Weiss law, but n TC deviates from mean field predictions. From the Arrott-Noakes equation of state, a relation between n TC and the critical exponents has been obtained, showing remarkable agreement with experimental data for an example alloy, predicted n=0.72 versus experimental n=0.73 . A master curve behavior for the temperature dependence of SM measured for different maximum fields is proposed. |
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