U. Köbler, A. Hoser^1,2, R.M. Mueller, K. Fischer
¹HMI-Berlin
²RWTH-Aachen

In cantrast to classical spin wave theories it was frequently observed experimentally that the thermal decrease of the spontaneous magnetization of ferromagnets can well be described by a single TE power term. We have performed systematic experimental studies of the TE laws and abserved that the empirical spin wave exponent E depends on the dimensionality of the magnetic interactians and on whether the spin quantum number is integral or half-integral. This implies a scheme af 6 different exponents E. Surprisingly, for the same class of materials E is independent of the spin order type.