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Phenomenological modelling of first order phase transitions in magnetic systems

Melikhov, Yevgen ORCID: https://orcid.org/0000-0002-9787-5238, Hadimani, R. L. and Raghunathan, Arun 2014. Phenomenological modelling of first order phase transitions in magnetic systems. Journal of Applied Physics 115 (18) , 183902. 10.1063/1.4875678

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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(SixGe1−x)4 system and also has the potential to describe the behavior of Griffiths phase magnetic systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: American Institute of Physics
ISSN: 0021-8979
Date of First Compliant Deposit: 12 September 2019
Date of Acceptance: 29 April 2014
Last Modified: 06 Jul 2023 18:45
URI: https://orca.cardiff.ac.uk/id/eprint/93145

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