耐熱型磁区細分化方向性電磁鋼板における直流磁化状態での磁区構造

抄録

Heat-resistant domain-refined grain-oriented electrical steel sheet is produced by applying domain-refining technology using linear grooves. We investigated the domain structure of grain-oriented silicon steel sheet with grooves formed on one side by electrolytic etching method. The domain structures on the grooved side and the flat side were observed by a type-II Lorentz SEM (Scanning Electron Microscope) method. The magnetic field was applied to the specimen in the rolling direction using a yoke with a magnetizing coil inside SEM.
In the demagnetized state, the domain structure consisted of main domains that were separated by 180 degrees domain walls and spike domains that were connected with the grooves. The width of the main domains on the grooved side was narrower than that of the flat side. In the DC magnetized process, the main domains having magnetization parallel to the external field widened. When the external field was increased, a shape of antiparallel domains occasionally changed from a stripe into a triangle. On the flat side, the triangular domains were connected with a line corresponding to the grooves.