Using far-infrared laser pulses, electron-spin resonance has been excited in ${\mathrm{Cd}}_{\mathit{x}}$${\mathrm{Mn}}_{1\mathrm{-}\mathit{x}}$Te in high magnetic fields up to 22 T at liquid-helium temperature. Electron-spin-resonance line shapes have been observed by monitoring the transmitted intensity. Simultaneously, the dynamic of the longitudinal magnetization was recorded with a pick-up coil showing, contrary to the transmission, a single line. The discrepancies were due to the geometrical interferences.

• Received 2 September 1993

DOI:https://doi.org/10.1103/PhysRevB.48.17580