Direct observation of the magnetic-field-induced entropy change in Gd5(SixGe1−x)4 giant magnetocaloric alloys

Felix Casanova, Amilcar Labarta, Xavier Batlle, Francisco J. Perez-Reche, Eduard Vives, Lluis Manosa, Antoni Planes

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Abstract

Direct observation of the entropy change in a first-order phase transition is obtained by using a differential scanning calorimeter in which the transition is field-induced under the application of an external magnetic field. This procedure enables direct evaluation of the magnetocaloric effect in materials showing first-order magnetostructural phase transitions. Results for Gd-5(SixGe1-x)(4) giant magnetocaloric alloys are reported. Calorimetric curves sweeping the field through the transition reveal a unusual increase of the entropy change with cycling. This increase is accounted for by considering both the structural and magnetic contributions to the total entropy change.

Original languageEnglish
Article number262504
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number26
DOIs
Publication statusPublished - 27 Jun 2005

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