Magnon dispersions in FeF₂ along two reciprocal-space directions (top and bottom rows), measured by inelastic neutron scattering (left) and reproduced by spin-wave simulations (right). Selected for an Editors’ Suggestion.

From the article:

Altermagnetic and Dipolar Splitting of Magnons in ${\mathrm{FeF}}_2$
J. Sears, V. O. Garlea, D. Lederman, J. M. Tranquada, and I. A. Zaliznyak
Phys. Rev. Lett. 136, 226701 (2026)

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