  Conventional wisdom suggests that one photon that carries one unit of angular
momentum can change the spin angular momentum of a magnetic system with one
unit (delta Ms = +-1) at most. This would imply that a two-photon scattering
process can manipulate the spin angular momentum of the magnetic system with a
maximum of two units. Here we examine the fundamental limit of the
photon-driven transport of angular momentum by studying the magnon spectrum of
{\alpha}-Fe2O3 using resonant inelastic x-ray scattering. We discovered a
cascade of higher-rank magnons carrying double, triple, quadruple, and
quintuple the spin angular momentum of a single-magnon. Guided by theoretical
calculations, we reveal how a two-photons scattering process can create exotic
higher-rank magnons and the relevance of these quasiparticles for magnon-based
applications.
