Magnons in van der Waals Antiferromagnetic Materials

Abstract Magnons, as the quanta of spin waves, have garnered significant attention in both fundamental research and applied fields. In recent years, the discovery of two‐dimensional magnetism has spurred the rapid expansion of the van der Waals (vdW) magnetic material family, establishing a robust material foundation for magnonics research based on vdW magnetic systems. This review summarizes recent advances in magnon physics within vdW antiferromagnetic materials, with a focus on two representative classes: Kitaev antiferromagnets and A‐type antiferromagnets. For Kitaev candidate materials such as α‐RuCl 3 , the characteristics of sharp magnon modes in bulk and few‐layer structures under various external stimuli are presented, and potential origins of continuum excitations are discussed, particularly the debate between fractionalized Majorana fermions and strong magnon decay. In A‐type vdW antiferromagnets (e.g., chromium trihalides, CrSBr, MnBi 2 Te 4 ), exotic magnon dispersions are described, including massive and massless Dirac magnons, and distinct antiferromagnetic resonance modes are analyzed along with tunable magnon–magnon coupling. Furthermore, electrically controlled magnon transport is discussed, and a concise outlook on this rapidly evolving field is provided.