Break-Down of Vertical-Bloch-Line Chains in Ordinary Hard Bubble Walls Subjected to an In-plane Field

Abstract

An experimental and theoretical study was carried out on the break-down of vertical-Bloch-line (VBL) chains in ordinary hard bubble walls subjected to an in-plane field, Hip. Other than a single critical value, a critical range of in-plane field, from Hip(1) to Hip(2), was found. When Hip < Hip(1) the VBL chains keep unchanged; whereas when Hip(1) < Hip < Hip(2), more and more hard domains are softened. Above Hip(2) all VBL chains are broken-down. A theoretical analysis showed that the critical range of Hip is originated from the serpentine curving of domain walls, and a relation Hip(2)/Hip(1)=√2, was obtained, which is in good agreement with the experiments.