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Title: Cooling and heating by adiabatic magnetization in Ni50Mn34In16 magnetic shape-memory alloy
Author: Moya Raposo, Xavier
Mañosa, Lluís
Planes Vila, Antoni
Aksoy, Seda
Acet, Mehmet
Wassermann, Eberhard F.
Krenke, Thorsten
Keywords: Propietats magnètiques
Materials magnètics
Transformacions martensítiques
Magnetic properties
Magnetic materials
Martensitic transformations
Issue Date: 2007
Publisher: The American Physical Society
Abstract: We report on measurements of the adiabatic temperature change in the inverse magnetocaloric Ni50Mn34In16 alloy. It is shown that this alloy heats up with the application of a magnetic field around the Curie point due to the conventional magnetocaloric effect. In contrast, the inverse magnetocaloric effect associated with the martensitic transition results in the unusual decrease of temperature by adiabatic magnetization. We also provide magnetization and specific heat data which enable to compare the measured temperature changes to the values indirectly computed from thermodynamic relationships. Good agreement is obtained for the conventional effect at the second-order paramagnetic-ferromagnetic phase transition. However, at the first-order structural transition the measured values at high fields are lower than the computed ones. Irreversible thermodynamics arguments are given to show that such a discrepancy is due to the irreversibility of the first-order martensitic transition.
Note: Reproducció digital del document publicat en format paper, proporcionada per
It is part of: Physical Review B, 2007, vol. 75, núm. 18, p. 184412-1-184412-5
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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