Influence of cubic crystalline anisotropy on the annihilation of Vertical Bloch lines in the walls of hard domains under in-plane field

In our paper, the cubic magnetocrystalline anisotropy was first considered while measuring the critical in-plane field range [Hip0, Hip2] of which vertical Bloch lines (VBLs) annihilated in the hard domains (Hip0 is the maximal critical in-plane field of which hard domains remain stable, Hip2 is the minimal critical in-plane-field of which all of the hard domains convert to soft bubbles (SBs) without VBLs). It was found that the critical in-plane fields change periodically when the crystal direction changes in plane, and their changes are opposite to the domain-erasing field. A six-fold symmetry of the critical in-plane field in the sample plane was observed. Applying in-plane field in different directions, the influence of crystal direction on the annihilation of VBLs in hard domain walls is of only a small magnitude.