Handling mixed-state magnetization data for magnetocaloric studies-a solution to achieve realistic entropy behaviour


We present an approach to extract a realistic magnetic entropy value from non-equilibrium magnetization data near the transition temperature of a typical first-order system with a mixed-phase state, influenced by the phase transformation, which is responsible for large values reported, even higher than the theoretical limit. The effect of the mixed-phase state is modelled in the magnetization and its non-physical contribution is removed to obtain the magnetic entropy in accordance with calorimetric experiment and theoretical simulation. This approach gives a reliable estimation of the magnetic entropy value incorporating experimental non-equilibrium magnetization data and correcting the use of Maxwell's relation.



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Das, S; Amaral, JS; Amaral, VS

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The authors thank D Rocco for sample preparation and S Gama and R Burriel for valuable discussions. The authors acknowledge the financial support from FCT through Project No CERN/FP/83643/2008, grants No SFRH/BPD/39262/2007 (S Das), SFRH/BD/17961/2004 and SFRH/BPD/63942/2009 (J S Amaral).

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