Abstract
A theory of resonance absorption in antiferromagnetics based on the spin wave theory developed by Anderson and Kubo is presented. The obtained resonance frequencies are given by two sharp ones, which are compared with the results of the classical theory by Nagamiya. In both cases the anisotropy energy has uniaxial symmetry. The absorption coefficient is also computed. Our calculations of the resonance frequencies are then extended to the antiferromagnetic having the anisotropy energy of ortho-rhombic symmetry. In the course of these calculations we obtained expressions for the magnetic susceptibility, using the obtained energy levels of the spin system which is subjected to a static magnetic field. They are in agreement with those which Kubo has already given by use of the method of statistical thermodynamics.
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