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Adiabatic magnetocaloric temperature change in polycrystalline gadolinium – A new approach highlighting reversibility
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/content/aip/journal/adva/2/3/10.1063/1.4748131
2012-08-22
2014-08-23

Abstract

The adiabatic temperature change (ΔT) during the magnetization and demagnetization processes of bulk gadolinium is directly measured for several applied magnetic fields in the temperature range 285 K to 305 K. During the magnetization process, ΔTmeasurements display the same maximum for each applied field when plotted against the initial temperature (T i ). However, during the demagnetization process, the maximum ΔT varies for each applied field. This discrepancy between the magnetization and demagnetizationmeasurements appears inconsistent with the reversibility of the magnetocaloric effect. A new approach is undertaken to highlight the reversibility of the magnetocaloric effect by plotting ΔT against the average temperature change (T avg ) instead of T i . The value of T avg which corresponds to the maximum ΔT is found to increase linearly with the applied magnetic field, consistently for both the magnetization and demagnetizationmeasurements. Solving the linear-fitting equations of these measurements gives a new, and more precise, Curie temperaturemeasurement. This new approach confirmed that the relationship between the maximum adiabatic temperature change (ΔT peak ) and the applied magnetic field is perfectly linear.

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Scitation: Adiabatic magnetocaloric temperature change in polycrystalline gadolinium – A new approach highlighting reversibility
http://aip.metastore.ingenta.com/content/aip/journal/adva/2/3/10.1063/1.4748131
10.1063/1.4748131
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