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Adiabatic measurement of the giant magnetocaloric effect in MnAs

AuthorsTocado, Leticia; Palacios, Elias; Burriel, Ramón
KeywordsGiant magnetocaloric effect
Heat capacity
Heating and cooling curves
Magnetic phase diagram
Issue DateApr-2006
CitationJournal of Thermal Analysis and Calorimetry 84(1): 213-217 (2006)
AbstractWe have studied the compound MnAs with a giant magnetocaloric effect, which has a magneto-structural transition at 316 K. The magnetic phase diagram has been deduced from adiabatic heat-capacity measurements and from cooling and heating curves. The ferroto paramagnetic transition changes with field from 316 K at 0 T to 335.3 K at 6 T. There is a strong thermal hysteresis between 10 and 5 K, depending on field. Direct measurements of the adiabatic temperature change caused by the application of magnetic field were made and compared with the values deduced from heat-capacity data.Moreover, adiabatic field cycles were performed quasi-statically between 0 and 6 T around the phase coexistence region, showing the strength of the effect in each phase and on the coexistence lines.
Description5 pages, 6 figures, 1 table.
Publisher version (URL)http://dx.doi.org/10.1007/s10973-005-7180-z
Appears in Collections:(ICMA) Artículos
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