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Theory of Raman light scattering in the many-sublattice exchange-noncollinear magnets UO2, RMnO3, and Nd2CuO4 (R=rare-earth ion).

The Raman light scattering from magnons in exchange-noncollinear many-sublattice magnets of different symmetry was studied theoretically. It is shown that in contrast to magnets collinear in the exchange approximation the intensity of scattering from the exchange magnons in exchange-noncollinear magnets is determined by the magneto-optic constants of the exchange nature, and does not contain any small factors. This intensity can be higher than the one for the acoustic magnons. The influence of the dipole-dipole interaction on the magnon states and selection rules for the Raman light scattering was investigated. Possible geometries of the light scattering from the longitudinal and transverse magnons are found.