Abstract
Magnetic resonances have been studied in ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Te as a function of the concentration x, by means of far-infrared magnetotransmission at fields up to B=22 T. For x\ensuremath{\ge}0.3 an antiferromagneticlike resonance is observed, having a g factor equal to 2. This resonance extrapolates to a finite zero-magnetic-field excitation energy which increases with concentration x. The results are explained in terms of a single-magnon excitation. For x\ensuremath{\le}0.1 EPR of the ${\mathrm{Mn}}^{2+}$ ions is observed, showing a significant line broadening which increase with magnetic field.
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