Modeling Hysteresis of First-Order Magneto-Structural Phase Transformations

In this paper, we use a thermodynamic model based on superposition of bistable contributions to describe the magnetization curve of materials with a magneto-structural phase transformation. In order to describe the decreasing coercivity with increasing temperature, we extend the model to temperature...

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Veröffentlicht in:	IEEE transactions on magnetics 2008-11, Vol.44 (11), p.3177-3180
Hauptverfasser:	Basso, V., Kuepferling, M., Sasso, C.P., LoBue, M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Coercive force Coercivity Cross-disciplinary physics: materials science rheology Entropy Exact sciences and technology Hysteresis Hysteresis modeling Magnetic hysteresis Magnetic materials Magnetism Magnetization magneto-caloric effect Materials science Mathematical models Maxwell equations Mn-As Other topics in materials science Paramagnetic materials Phase change materials Phase transformations Physics Refrigeration Temperature distribution Thermodynamic models Thermodynamics
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Beschreibung
Zusammenfassung:	In this paper, we use a thermodynamic model based on superposition of bistable contributions to describe the magnetization curve of materials with a magneto-structural phase transformation. In order to describe the decreasing coercivity with increasing temperature, we extend the model to temperature-dependent distributions. We derive the expression for the entropy change, and we apply it to a case of interest for magnetic refrigeration.
ISSN:	0018-9464 1941-0069
DOI:	10.1109/TMAG.2008.2002796