Relaxation times and cell size in nonzero-temperature micromagnetics

In nonzero-temperature micromagnetics the intrinsic magnetic parameters depend on the computational cell size. For large cells the experimentally measured, only temperature dependent intrinsic properties can be used. For simulations on an atomistic level the experimentally measured zero-temperature values can be applied. In between, the intrinsic magnetic properties follow scaling laws which can be derived from Metropolis Monte Carlo simulations. Equilibrium magnetization states and thermally activated switching processes of small ferromagnetic cubes were calculated. With proper scaling of the material parameters the numerical results were found to be almost independent of the computational cell size.