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

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7 Author(s)
Casanova, Felix ; Departament de Física Fonamental, Universitat de Barcelona, Diagonal 647, 08028-Barcelona, Catalonia, Spain ; Labarta, Amilcar ; Batlle, Xavier ; Perez-Reche, Francisco J.
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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 Gd5(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.

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Applied Physics Letters  (Volume:86 ,  Issue: 26 )