Abstract
The modulation of light passing through a crystal of CoCO 3 at the excitation of antiferromagnetic resonance (AFMR) was found. The excitation of AFMR leads also to a change in the magnitude of the magnetic birefringence. These experiments show that the number of excited magnons with K ≠ 0 is 10 3 times greater than the number of magnons with K = 0. The spectrum of light scattered by excited magnons (90° degree scattering) shows that the dominating process of AFMR relaxation is an elastic two-magnon process.
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