Abstract
The calculation of the spin wave spectrum by the symmetry analysis method is given in this work. The symmetry calculations are based on the P-type colour group as the symmetry group of magnetic structure. It is consistent with the exchange approximation of the spin wave Hamiltonian. The method is applied to the spin wave spectrum calculation for hexagonal manganites LMnO 3 (L = Er, Ho, Lu, Sc, Tm, Y) and wave vector q = (0, 0, μ). As a result the 4 spin wave branches dependent on 4 exchange integrals are given. Two of which are nondegenerated. The λ 2( q) → 0 with q → 0 for two branches.
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