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International audienceCollective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd1–xMnxTe quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin subbands and a spin polarization is induced in the electron gas. Above 1 T the collective modes, which disperse with the in-plane wave vector, dominate the spectra. The local spin-density approximation provides a good description of our results and enables us to confirm that the energy of the low wave vector collective mode is given by the bare Zeeman energy

Spin Excitations of the Spin-Polarized Electron Gas in Semimagnetic Quantum Wells