ANISOTROPIC DYNAMICAL SCALING IN A SPIN MODEL WITH COMPETING INTERACTIONS

Results are presented for the kinetics of domain growth of a two-dimen sional Ising spin model with competing interactions quenched from a di sordered to a striped phase. The domain growth exponents are beta=1/2 and beta=1/3 for single-spin-flip and spin-exchange dynamics, as found in previous simulations. However, the correlation functions measured in the direction parallel and transverse to the stripes are different as suggested by the existence of different interface energies between the ground states of the model. In the case of single-spin-flip dynami cs an anisotropic version of the Ohta-Jasnow-Kawasaki theory for the p air scaling function can be used to fit our data.