Magnetic Phase Transitions and Modulated Magnetic Structures

The magnetooptic properties of FeBO_3are determined by the limits in the dielectric absorption tensor, which depend on the ferro and antiferromagnetism vectors. The theory of phase transitions is based on the ordering field that arises due to the interaction of particles. The theory is simplified if we consider the area equal to the average area. It is this mean-field theory that is often the focus of attention.