“Two-steps” process in the first-order transformation of giant magnetocaloric materials
Résumé
The most promising materials for applications in magnetic refrigeration exhibit a large entropy change at a first-order ferromagnetic transition. Often, it has been observed that the transformation proceeds via two bursts surrounding a regime of slow transformation. Within a simplified framework, the present article reports on a thermodynamic model able to account for this “two-steps” response. This model is confronted to magnetic and calorimetric data recorded in the magnetocaloric compound LaFe11.4Si1.31Co0.29 .
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