Generation, electric detection, and orbital-angular momentum tunneling of twisted magnons

A scheme for generating twisted magnons that carry orbital angular momentum in ferromagnetic nanodisks is presented. The topological signature of these eigenmode excitations entails particular features in the associated spin pumping currents. The latter is electrically detectable and can be used to identify these magnons. Considering two disks coupled via the dipole interaction, angular momentum tunneling is demonstrated. The predictions are based on a transparent analytical model and are confirmed by full numerical simulations. As the orbital angular momentum of the magnon is robust to damping, the current findings endorse the potential of twisted magnons for two-dimensional planar integrated spin-wave circuits