On the effect of material inhomogeneities on the generation of vertical Bloch lines

The effects of inhomogeneities of the drive field H_z and of the in-plane anisotropy on the generation of vertical Bloch line pairs in the stripe domain wall were investigated numerically. It was found that the inhomogeneity of H_z does not cause the generation of vertical. Bloch line pairs in the linear range of wall motion (i.e. H_z<H_zcrit). In the case of the inhomogeneity of the in-plane anisotropy, however, the generation of vertical Bloch lines appears also for H_z<H_zcrit, provided that such an inhomogeneity is sufficiently large.