Domain branching in surface layer of laser treated Finemet

We have studied the domain branching in surface layers of the excimer laser treated Finemet ribbon. Small circular holes produced by laser radiation o n the surface of ribbons reduce the power losses at higher frequencies. The domain structure was visualized by means of a SEM and by a set-up based on the Kerr effect. in the close proximity to the circular holes the demagnet izing field causes the domain refinement. On the basis of the minimum energ y's condition we have calculated the geometric parameters of the newly form ed small domain. We have compared the calculated parameters with the experi mentally determined values.