Stability Of Vertical Bloch Line Chain In The Walls Of Multi-branched Domains Subject To An In-plane Field

The annihilation of Vertical Bloch Line (VBL) chains in the walls of multi-branched domains (MBD) subject to an in-plane field was studied experimentally for the first time. It was shown that VBLs in the walls of MBD which was formed by using the low static bias fields gradually annihilated, and a critical in-plane field range was also found. The MBDs in the compressed state and the MBDs in the uncompressed state was compared in the experiment. It was shown that the value of the in-plane was different at R_IID= 0 when the MBDs in the compressed state was softened. The value of the in-plane was decreasing at R_IID= 0 with the increase of the static bias fields, thus it is proved that VBL in the walls of MBD is irregular and there exists a direction along which the VBL in the domain walls annihilate most easily.In addition, in the paper we also studied the annihilation of ordinary hard bubbles (OHB) by screening in order to measure accurately the critical in-plane field range. In the improved experiment the softening percentage ofOHB was large at the critical in-plane field thus the critical in-plane field range related to the parameters of the samples was measured accurately in the paper. Meanwhile facts have proved that OHB including less VBL is OHB which will lose VBL at the critical in-planefield...