Phenomenological modelling of first order phase transitions in magnetic systems

被引：5
作者：
Melikhov, Yevgen [1 ,4 ]
Hadimani, R. L. [2 ]
Raghunathan, Arun [3 ]
机构：
[1] Cardiff Univ, Sch Engn, Wolfson Ctr Magnet, Cardiff CF24 3AA, S Glam, Wales
[2] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA
[3] GE India Technol Ctr, Bangalore 560066, Karnataka, India
[4] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
来源：
JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 18期
关键词：
JILES-ATHERTON THEORY; TEMPERATURE-DEPENDENCE; HYSTERESIS; GD-5(SIXGE1-X)(4); STRESS;
D O I：
10.1063/1.4875678
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 Gd-5(SixGe1-x)(4) system and also has the potential to describe the behavior of Griffiths phase magnetic systems. (C) 2014 AIP Publishing LLC.
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页数：5
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