The antiferromagnetic resonance spectrum in LaMnO3

The substantially noncollinear structure realized in LaMnO3 in external magnetic field is studied. A field diagram of the natural magnetic oscillations of the system is constructed. It is shown that the neglect of Dzyaloshinskii interaction, which, as argued by some authors, is due to the small value of the corresponding constant of the spin Hamiltonian as compared to the anisotropy one, leads to an incorrect description of the system dynamics.