Title :
A thermodynamic representation of pseudoparticles with hysteresis
Author :
Bergqvist, Anders ; Engdahl, Göran
Author_Institution :
R. Inst. of Technol., Stockholm, Sweden
fDate :
11/1/1995 12:00:00 AM
Abstract :
A method of expressing pseudoparticles with hysteresis within a context of irreversible thermodynamics is investigated. The state of a pseudoparticle is uniquely determined by its magnetization and its evolution is governed by entropy maximization. Hysteresis appears if the free energy is a nonconvex function of magnetization. The vectorial nature of magnetization and dependence on rate are accounted for in a systematic manner. Some basic properties are derived for quasistatic processes. In particular, it is found that in the scalar case, the magnetization is a monotonically increasing functional with respect to field and that for quasistatic processes, this implies the wiping-out property
Keywords :
ferromagnetic materials; ferromagnetism; free energy; irreversible thermodynamics; magnetic hysteresis; magnetic particles; maximum entropy methods; entropy maximization; ferromagnetic materials; field dependence; free energy; hysteresis; irreversible thermodynamics; magnetization; pseudoparticles; quasistatic processes; wiping-out property; Entropy; History; Magnetic flux; Magnetic hysteresis; Magnetic properties; Magnetization; Power engineering; Power engineering and energy; Temperature; Thermodynamics;
Journal_Title :
Magnetics, IEEE Transactions on
