Figure 3: Pair creations of skyrmion–antiskyrmion for dipolar magnet.

A parameter set {L=150 × 150, Idip/J=0.094, K/J=0.6, H/J=0.04, α=1.0} with open boundary condition (OBC) is used. (a) Initial state. (b–d) The snapshots of magnetic structure at t=200, 450 and 1,000 in units of 1/(γJ), respectively. The colour code (i) is the same as in Fig. 1. (e–h) The spatial distribution of bz. The scale of bz is shown in j.