Fig. 2
From: Twisted magnon beams carrying orbital angular momentum
Spiraling spin wave propagating along a cylindrical micro-scale waveguide of the insulting magnet yttrium iron garnet. a Snapshot of the magnon beams after 2 ns for the x-component of the triggered magnetization. b Vortex configuration of the excitation modes along the waveguide. c The z-resolved amplitude and the orbital angular momentum of the spin waves. In a–c, the spin waves are excited locally at one end of the waveguide by a twisted radio frequency (rf) magnetic field having the peak amplitude Bmax = 10 mT, and a frequency ωB = 5 GHz. For the time evolution of mx at the transversal slice z = 1 μm see Supplementary Movie 1
