Temperature dependence of magnetization in ultrathin MnTe films

Spin waves and the temperature dependence of local magnetization are investigated in ultrathin MnTe(100) films with antiferromagnetic ordering of type III. Calculations are performed within the framework of the Heisenberg model with use of the Green function formalism. At a given temperature the local magnetization is calculated in a self-consistent way. The influence of parameter changes in thin films (exchange integrals, anisotropy constants) on the energy spectrum, local magnon density of states and local magnetization is investigated. The obtained results strongly depend on values of exchange integrals whereas the influence of changes in anisotropy constants is very weak. When the integrals in the growth direction are lower than in-plane values the temperature dependence of the mean magnetization does not strongly depend on the film thickness in consistency with experimental data.