High-field magnetic resonances inCd1−xMnxTe at far-infrared energies

Magnetic resonances have been studied in ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Te as a function of the concentration x, by means of far-infrared magnetotransmission at fields up to B=22 T. For x≥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≤0.1 EPR of the ${\mathrm{Mn}}^{2+}$ ions is observed, showing a significant line broadening which increase with magnetic field.