Id Under Dc Bias Field And The Surface Of The Combined Effects Of Vbl Stability Of Domain Wall

The ultra-high-density Bloch line memory (BLM) uses negative vertical-Bloch-line (VBL) pairs in the walls of hard domains as information carriers. So it is important to investigate the stability of the vertical-Bloch-line for developing the BLM and enriching the theory of Magnetic domain walls. The static bias field (H_b) and in-plane field(Hjp), two important factors, will affect the vertical-Bloch-lines in hard domain. The critical in-plane field for the annihilation of the VBLs, related to materials parameters, had been discovered during last experiments. Wang et al have investigated VBLs in the walls of the second kind of the dumbbell domains (IIDs) and the ordinary hard bubbles (OHBs) are subjected to the jointing of the static bias field and the in-plane field, and find some important rules. What are the behaviors of the first kind of the dumbbell domains (IDs) subjected to joint the static bias field and the in-plane field? And what difference and indifference are between three kinds of hard bubbles? This is the reason of my paper.Firstly, we get several curves of the retention rate of IDs vs Hj_P and maximal collapse field (H_col,max) of IDs vs H_ip at different H_b. Along with the increasing of H_b, the curves decrease more fast. At the same time, spontaneous-shrink of ID plays more important role.Secondly, in order to explain the annihilation of the VBLs in the walls of three hard domains, at the same condition, IID and OHB are done the same experiment. Compared the softening processes of IID, ID and OHB, it is found that: H_ip² are same andHj[} are IID < ID < OHB at the same Hb;with the increasing of Hb, HJJ* and H