For the first kind of dumbbell domains (IDs) of garnet bubble films, the annihilating process of vertical bloch line chains (VBLs) subjected to an in‐plane field ($ H_{\rm ip} $) at various static bias fields ($ H_{\rm b} $) was experimentally studied. Three important relations have been obtained, which are the relations between $ H_{\rm ip}^{(1)} $, $ H_{\rm ip}^* $, $ H_{\rm ip}^{(2)} $ and $ H_{\rm b} $. here, $ H_{\rm ip}^{(1)} $ is the initial critical in‐plane field where VBLs in the walls of IDs are annihilated, i.e. some of the ID begin to be softened, $ H_{\rm ip}^* $ is designated as the in‐plane field where ID begins to soften to SB and $ H_{\rm ip}^{(2)} $ is the lowest in‐plane field at which all VBLs in the walls of IDs annihilate completely. by the experiment of the so‐called “tail‐cut”, it is found that each $ H_{\rm ip} $ from $ H_{\rm ip}^{(1)} $ to $ H_{\rm ip}^{(2)} $ corresponds to a certain length of VBL chains in the walls of IDs. the higher $ H_{\rm ip} $, the shorter the VBL chains. $ H_{\rm ip}^{(1)} $ and $ H_{\rm ip}^{(2)} $ correspond to the longest and shortest VBLs, respectively. it is also found that both $ H_{\rm ip} $ and $ H_{\rm b} $ play an important role during the annihilating of vbl chains in the walls of IDs. If $ H_{\rm b} $ is lower, $ H_{\rm ip}^{(1)} $, $ H_{\rm ip}^* $ and $ H_{\rm ip}^{(2)} $ are unchanged. with increasing $ H_{\rm b} $, especially being close to or higher than the standard stripe‐to‐bubble transition field ($ H_{\rm sb} \prime $), they all rapidly decrease. And they do not change further when $ H_{\rm b} $ is a little higher than the minimum collapse field of OHBs ($ H_0 \prime $). (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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