Journal of Thermal Analysis and Calorimetry

, Volume 84, Issue 1, pp 213–217

Adiabatic measurement of the giant magnetocaloric effect in MnAs

Article

DOI: 10.1007/s10973-005-7180-z

Cite this article as:
Tocado, L., Palacios, E. & Burriel, R. J Therm Anal Calorim (2006) 84: 213. doi:10.1007/s10973-005-7180-z

Abstract

We 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.

Keywords

giant magnetocaloric effectheat capacityheating and cooling curvesmagnetic phase diagram

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Instituto de Ciencia de Materiales de AragónCSIC – Universidad de ZaragozaZaragozaSpain