THE ANNIHILATION OF VBLS IN THE WALLS OF 2ND-KIND OF DUMBBELL DOMAINSTO WHICH BIAS FIELDS AND INPLANE FIELDS ARE ALTERNATELY APPLIED

The annihilation of vertical Bloch lines in magnetic domain walls of t he second kind of dumbbell domains, to which both bias fields and in-p lane fields are alternately applied, are investigated experimentally. A critical in-plane field range [H-ip((0)),H-ip'] is found. We hypothe size that there exists a direction along which the vertical Bloch line s in the domain walls annihilate most easily. It is observed that the annihilation of vertical Bloch lines in the domain walls does not depe nd on the initial state. This provides a more detailed description of the minimum critical in-plane field than obviously known. (C) 1997 Els evier Science B.V. All rights reserved.