On the direct measurement of the adiabatic temperature change of magnetocaloric materials

Direct measurement of an adiabatic temperature change in magnetocaloric materials is fundamental to design efficient and eco-friendly magnetocooling devices. This work reports an overview of the measurement principle and the main experimental issues that have to be considered to obtain a reliable ch...

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Bibliographic Details
Published in:Journal of applied physics 2020-03, Vol.127 (12)
Main Authors: Cugini, F., Solzi, M.
Format: Article
Language:English
Subjects:
Adiabatic conditions
Applied physics
Finite difference method
Magnetic materials
Temperature sensors
Thermal simulation
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Summary:Direct measurement of an adiabatic temperature change in magnetocaloric materials is fundamental to design efficient and eco-friendly magnetocooling devices. This work reports an overview of the measurement principle and the main experimental issues that have to be considered to obtain a reliable characterization of materials. The effect of non-ideal adiabatic conditions, the role of the temperature sensor, and the influence of specific properties of the material are discussed on the basis of finite-difference thermal simulations and specially designed experiments. Two cases are considered in detail: the characterization of thin samples and the measurement of caloric response to fast field changes. Finally, the impact of different measurement protocols is discussed in the case of materials with first-order transitions.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0002870