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4. On the broadening of the magnetic entropy change due to Curie temperature distribution

Author

Universidad de Sevilla. Departamento de Física de la Materia Condensada, Franco García, Victorino, Álvarez Alonso, Pablo, Sánchez Llamazares, José L., Sánchez Valdés, César F., Cuello, Gabriel J., Gorria, Pedro, Blanco, Jesús A., Universidad de Sevilla. Departamento de Física de la Materia Condensada, Franco García, Victorino, Álvarez Alonso, Pablo, Sánchez Llamazares, José L., Sánchez Valdés, César F., Cuello, Gabriel J., Gorria, Pedro, and Blanco, Jesús A.

Abstract

We have studied the correlation between the broadening of the isothermal magnetic entropy change and the Curie temperature (TC) distribution in nanostructured Pr2Fe17 and Nd2Fe17 alloys produced by high-energy ball-milling after milling times of 10, 20, and 40 h. The changes in the microstructure affect the Fe local environments and as a consequence the magnetic interactions, giving rise to TC distributions centered around 285 K and 330 K for the Pr2Fe17 and Nd2Fe17 alloys, respectively. The width of the distributions enlarges (up to 60 K) as the milling-time increases, and consequently, the isothermal magnetic entropy change curves show an extended full width at half maximum.

Published
2014

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