Magnetostruction change of grain oriented Si-Fe sheet sample declined from rolling direction under field and stress

Abstract

The magnetostriction has major responsible for the noise of transformer core. Therefore it is very important to investigate the mechanism of appearance and the properties for magnetostricton. Magnetostriction of the Si-Fe sheets is very small as their magnetization mainly proceeds with the displacement of the 180" domain. However, large magnetostriction occurs on the sample, when the direction of magnetization inclined from [OOl] direction of rolling direction 14. Therefore the research ofmagnetostriction for the Si-Fe sheets, whose direction of magnetization is not parallel to rolling direction, has become more important. We investigated, in this paper, the propehes of magnetostriction change and the domain structure change of declined sample from rolling direction. We also investigated the effect of shess on the magnetostriction change t o make clear the mechanism of magnetostriction change.