Abstract
Ferromagnetic ordering in a two-level partially excited system is studied in detail. Magnitudes of magnetization (magnetic order parameter) and lattice ordering (excited level occupation number) are calculated self-consistently. The influence of an external magnetic field and excited level gap on the ferromagnetic phase transition is discussed.
Highlights
In numerous instances of real physical systems, the problem of ferromagnetic ordering strongly depends on the density of magnetic particles in a medium
That is why for the first order magnetic phase transition, a sharp decrease of the excited level occupation is observed above the phase transition temperature point Tc [see figures 2 (a)–(d)]
A self-consistent theory for a description of the excited energy levels occupation and spin-orientation ordering in the crystalline lattice is proposed
Summary
In numerous instances of real physical systems, the problem of ferromagnetic (or ferroelectric) ordering strongly depends on the density of magnetic (or dipole) particles in a medium. Such a situation is observed in different types of materials, namely in solids and liquids. The degree of occupation of the ground and excited states depends on their mutual energy distance and the intensity of radiation (thermostat temperature). Their intensity essentially depends on the correlations between ground-ground, ground-excited and excited-excited states of particles Both an external magnetic field and radiation (thermostat temperature) form self-consistent thermodynamic states of a system with a certain magnetization and an excited state occupation. Solovyan to the analysis of a correlation between spin orientation and occupation processes, as well as to the role of the external magnetic field and interlevel distance in the stable state of a system formation
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