Magnetization and magnetoreflectance inZn1−xMnxTe

The exchange splitting of the free-exciton state in ${\mathrm{Zn}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Te (x<0.5) is studied by magnetoreflectance experiments carried out up to 6.5 T, for σ and π light polarization. Magnetization measurements made up to 15 T determine the mean value of the ${\mathrm{Mn}}^{2+}$ spins along the magnetic field. Comparison of magneto-optical with magnetic data, obtained for the same samples, at 1.86 K, in the paramagnetic region (x≤0.17) shows an excellent agreement with the simple exchange interaction model and yields precise values of exchange integrals of ${\mathrm{Mn}}^{2+}$ ions with conduction and valence electrons (-0.18 and 1.05 eV respectively). Fits of the magnetization data are also described.