摘要
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,H_(ip).Other than a single critical value,a critical range of in-plane field,from H_(ip)^(1) to H_(ip)^(2),was found.When H_(ip)<H_(ip)^(1) the VBL chains keep unchanged;whereas when H_(ip)^(1)<H_(ip)<H_(ip)^(2),more and more hard domains are softened.Above H_(ip)^(2) all VBL chains are broken-down.A theoretical analysis showed that the critical range of H_(ip) is originated from the serpentine curving of domain walls,and a relation H_(ip)^(2)/H_(ip)^(1)=√2,was obtained,which is in good agreement with the experiments.
