Abstract
We analyze the kinetics of domain growth for a Hamiltonian which models the formation of ordered monolayers of H on a (110) surface of Fe. Monte Carlo simulations using particle exchange dynamics have been used to study the unstable growth of domains for coverages θ = 0.5 (for which the stable phase is (2 × 1)) and θ = 0.666 (for which the stable phase is (3 × 1)). In the former case, the ground state degeneracy is p = 2 and the average domain size follows an Allen-Cahn power law with an exponent x = 1 2 . In the latter case we find a much slower growth due to interface diffusion. However, we cannot characterize this growth by a simple power law behavior for the time regime investigated. There are also some indications that the growth in this phase could be anisotropic.
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