Correction to: Nature https://doi.org/10.1038/s41586-018-0432-4, published online 22 August 2018.

In this Letter, there were four incorrect figure citations. In the sentence “However, at −2.4 T we obtain a domain pattern that is nearly identical to that at +2.4 T (Fig. 2b), but with the brightness of each domain inverted (Fig. 2d).”, Fig. 1a and d were wrongly cited. In the sentence “The reversal occurs via intermittent formation and shifts of domain walls (Fig. 2c).”, Fig. 1c was wrongly cited. In the sentence “According to the magnetic-field dependence of the SHG interference shown in Fig. 2e, integrated over the range −3 T to +3 T over two spots of about 500 μm, the most substantial domain variations occur between −0.2 T and +0.2 T.”, Fig. 1e was wrongly cited. These errors have been corrected online.