Convergence of direct and indirect methods in the magnetocaloric study of first order transformations: The case of Ni-Co-Mn-Ga Heusler alloys

The study of two aspects of the magnetocaloric effect (MCE), namely, the matching between isothermal entropy change and direct adiabatic temperature change, is not straightforward since huge differences between these two quantities have often been reported. Here we put in relation the direct and ind...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-09, Vol.86 (10), Article 104432
Main Authors: Porcari, G., Cugini, F., Fabbrici, S., Pernechele, C., Albertini, F., Buzzi, M., Mangia, M., Solzi, M.
Format: Article
Language:English
Subjects:
Alloys
Condensed matter
Convergence
Heusler alloys
Magnetic fields
Nickel base alloys
Scanning
Transformations
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Summary:The study of two aspects of the magnetocaloric effect (MCE), namely, the matching between isothermal entropy change and direct adiabatic temperature change, is not straightforward since huge differences between these two quantities have often been reported. Here we put in relation the direct and indirect measurements on the first order magnetostructural martensitic transformation occurring in Ni-Co-Mn-Ga alloys. In order to complete the characterization of the MCE and to find an explanation of these mismatches, differential scanning calorimeter measurements have been performed at different applied magnetic fields.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.104432