Abstract
Globus' model was used to investigate the domain structures of MnZn ferrites. The model assumes that the energy losses during a cycle in the expression of the hysteresis loop have two origins: the continuous pinning of the domain wall and the formation and destruction of a fraction of the wall surface. In the case of MnZn ferrites, the pinning force is proved to be negligible, and the wall energy derived from this model shares a temperature dependence with hysteresis losses. Although Globus' model postulates that a grain includes only one domain wall, our experimental results for samples with various average grain diameters indicate that at room temperature, grains with an average diameter of more than 8 μm would include more than two unit cells in which one domain wall moves. At higher temperatures, the difference in cell sizes becomes smaller as the magnetocrystalline energy K1 approaches zero.
