Phenomenological modelling of first order phase transitions in magnetic systems

Date
2014-01-01
Authors
Melikhov, Yevgen
Hadimani, Ravi
Raghunathan, Arun
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Abstract

First order phase transitions may occur in several magnetic systems, with two structural phases having different magnetic properties each and a structural transition between them. Here, a novel physics based phenomenological model of such systems is proposed, in which magnetization is represented by the volumetric amounts of ferromagnetism (described by extended Jiles-Atherton theory) and paramagnetism (described by the Curie-Weiss law) in respective phases. An identification procedure to extract material parameters from experimental data is proposed. The proposed phenomenological approach was successfully applied to magnetocaloric Gd5(Six Ge 1−x)4 system and also has the potential to describe the behavior of Griffiths phase magnetic systems.

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The following article appeared in Journal of Applied Physics 115 (2014): 183902 and may be found at http://dx.doi.org/10.1063/1.4875678.

Keywords
Curie point, Magnetic fields, Paramagnetism, Ferromagnetic materials, Magnetic materials
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