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We have measured antiferromagnetic resonance (AFMR) frequency-fielddependences for aluminum-manganese garnet Mn$_{3}$Al$_{2}$Ge$_{3}$O$_{12}$ atfrequencies from 1 to 125 GHz and at the fields up to 60 kOe. Three AFMR modeswere observed for all orientations, their zero field gaps are about 40 and 70GHz. Andreev-Marchenko hydrodynamic theory [Sov. Phys. Usp. 130, 39 (1980)]well describes experimental frequency-field dependences. We have observedhysteresis of resonance absorption as well as history dependence of resonanceabsorption near gap frequencies below 10 kOe in all three measured fieldorientations, which are supposedly due to the sample domain structure.Observation of the AFMR signal at the frequencies from 1 to 5 GHz allows toestimate repulsion of nuclear and electron modes of spin precession in thevicinity of spin-reorientation transition at H||[100].

Experimental study of antiferromagnetic resonance in noncollinear antiferromagnet Mn$_{3}$Al$_{2}$Ge$_{3}$O$_{12}$