The absorption of SHF power in the quasi-one-dimensional antiferromagnet CsMnCI3·2H2O is studied. Homogeneous antiferromagnetic resonance (AFMR) at frequencies of 10−130 GHz with T = 1.46°K and its temperature and angular dependences are studied. It is established that the size of the energy gap in the AFMR spectrum varies with an increase in temperature in proportion to the magnetization of the sublattice. Features of the absorption spectrum due to the low dimensionality of the magnetic structure of this crystal are found: two-magnon subthreshold absorption with the participation of magnons from the upper and lower branches of the spin-wave spectrum. The frequency-field dependences of these bands are studied.
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