Correction to: Nature Materials https://doi.org/10.1038/s41563-024-02065-x, published online 3 January 2025.

In the version of the article initially published, in the “Propagating magnons in nanoscale channels” section, “γ/2π = 2 GHz T−1 is the gyromagnetic ratio” should have read “γ/2π = 28 GHz T−1 is the gyromagnetic ratio” and has now been corrected in the HTML and PDF versions of the article.