MAGNETIZATION REVERSAL IN METALLIC-GLASS RIBBONS

The magnetization reversal processes in metallic glass ribbon (VITROVAC 6030) toroidal cores were investigated under the condition of magnetizing field linearly increasing with time. In contrast with results obtained earlier for Permalloy thin tape cores, in which the magnetization reversal proceeds at low rate of rise of the field by the motion of a single domain wall, in the narrow metallic glass cores this process takes place by the motion of two walls, nucleated at both thin ribbon edges, which propagate in towards the ribbon centre. For wider ribbons the number of active walls per unit width increases, a result which is consistent with the one showing that the excess losses are several times lower for wider ribbon than for the narrow one. © 1990 IEEE