Lumped Constant Model for VBL Pair

In addition to the usual lumped constant model for vertical Bloch lines, the authors introduce exchange repulsive forces acting between VBL, and processing to describe passing of normal domain wall points by VBL. Assumptions regarding ϕ_n and δϕ_n are made for BL winding in the positive and negative directions, and an empirical formula for the repulsive force in terms of the VBL separation is derived from distributed VBL model simulations. The passing processing assumes normal domain wall points approached by VBL points to vanish, while at the same time new wall points are generated behind the VBL point.