Abstract
The variation of domain structure with sheet thickness in single crystal plates of 3% Si-Fe having near (110) [001] orientation was studied experimentally and theoreticlly in the thickness range 0.3-0.5 mm. It was found that the abrupt widening of the domain wall spacing and the disappearance of the sub-domain occur below about 0.1 mm. This can be explained by the increase of magnetostostatic interaction between the free poles at the upper and lower surfaces of the plate and subsequent decrease of the inclination angle of the magnetization out of the sheet plane.
