Magnetization Processes and Reversal in Ferrimagnetic Oxides with High-Anisotropy Field

Abstract
The magnetization process of SrO·4Fe2O3·2A12O3 single crystals with 2–4 domains was investigated. The total area of the Bloch walls diminished during their displacement and the saturation was reached at 75 Oe. The magnetization reversal occurred by nucleation and growth of a reverse domain and the nucleation field shifted towards higher negative values for increased values of the magnetizing field. For nucleation fields higher than 75 Oe the reversal of the magnetization occurred abruptly and the hysteresis loop became ideally rectangular.