Topological switching in bilayer magnons via electrical control

Topological magnons hold promise for lossless information processing, but their electrical control remains challenging due to charge neutrality. Here, the authors propose a general strategy for electrically controlling topological magnons in bilayer ferromagnets with strong spin-layer coupling. An applied vertical electric field modulates intralayer Heisenberg exchanges between layers, which competes with Dzyaloshinskii-Moriya interaction, enabling precise manipulation of magnon band topology and nonreciprocity. Furthermore, this mechanism strongly couples with external magnetic fields, unveiling new perspectives on magnetoelectric coupling in charge-neutral quasiparticles.