Correction to: Nature https://doi.org/10.1038/s41586-025-09633-4 Published online 22 October 2025

In the version of the article initially published, the last sentence of the caption for Fig. 2 read “The colours of the spins in panels d and i indicate phase of a spin spiral” but should have read “The colours of the arrows in panels d and i correspond to the z-component of the magnetic moment”. This has now been corrected in the HTML and PDF versions of the article.