Abstract
The magnetic stray field generated from domains and Bloch walls of 3% Si-Fe sheets have been measured precisely and automatically by using a Hall sensor and an averaging device connected to a personal computer. The results show that the strength of the field normal to the grain surface depend strongly on the main 180°domain width and the grain orientation, which can be explained by the theoretical analysis considering the magnetostatic interaction of the sheet. The Bloch wall mappings estimated from the measurements of stray field distributions for single crystal sheets and highly grain oriented sheets (Hi-B) are in good agreement with the practical arrangement observed by means of a colloid displaying device. Furthermore, the influences of thickness, demagnetization frequency, scratching and lamination, as the factors affecting on the stray field, are discussed.
