  The temperature dependence of mesoscopic spin-model parameters is derived in
two-sublattice antiferromagnetically aligned systems based on Green's function
theory. It is found that transversal spin correlations decrease the anisotropy
terms while increasing the Heisenberg and Dzyaloshinsky--Moriya exchange
interactions and the latter's contribution to the anisotropy. The obtained
temperature dependences show quantitative agreement with the results for
ferromagnets, and they also agree well with numerical atomistic simulations
which treat the spin correlations without approximations. Possible applications
of the results in multiscale modelling are discussed.
