Angular dependence of magnetization reversal critical fields in individual grains of REFeB magnets

The magnetization reversal behaviour of individual grains was studied by direct domain structure observations. On this basis the angular dependence of the saturation field Hs, critical field of reverse domain removal, Hk, and nucleation field Hn was found to obey the law 1/cos(ϕ − ϕm), where ϕm is the angle between the grain easy axis and the axis of magnet texture.