Abstract

The annihilation of vertical Bloch lines in magnetic domain walls of the second kind of dumbbell domains, to which both bias fields and in-plane fields are alternately applied, are investigated experimentally. A critical in-plane field range [ H ip (0), H ip′] is found. We hypothesize that there exists a direction along which the vertical Bloch lines in the domain walls annihilate most easily. It is observed that the annihilation of vertical Bloch lines in the domain walls does not depend on the initial state. This provides a more detailed description of the minimum critical in-plane field than obviously known.

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