Magnetization reversal in metallic glass ribbons

Magnetization reversal processes in metallic glass ribbon (VITROVAC 6030) toroidal cores were investigated under the condition of a magnetizing field linearly increasing with time. In contrast with results obtained earlier for Permalloy thin tape cores, in which the magnetization reversal proceeds at a low rate of rise of the field due to the motion of a single domain wall, in the narrow metallic glass cores this process takes place due to the motion of two walls, nucleated at both thin ribbon edges, which propagate in towards the ribbon. For wider ribbons the number of active walls significantly increases with an increase of ribbon width. These results are qualitatively consistent with the finding that for the wider ribbon the excess eddy-current losses are several times lower than for the narrower one