Journal
APPLIED PHYSICS LETTERS
Volume 86, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1968431
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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 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.
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