Magnetic Stripes on Hexagonal Lattice with Competing Exchange and Dipole-Dipole Interactions

We obtained the phase diagram for the Ising model with competing exchange and dipolar interactions on 2D hexagonal lattice. By using histogram method we determined the order of the phase transition from isotropic stripe phase to low-temperature anisotropic stripe phases AFh of different stripe widths h. The first order phase transition was found to AF1 and AF2 phases and the second order - to AF3 and AF4 phases. We have also found that in AF1 phase stripe domain grows with time as $t^{0.5}$. In phases AF3 and AF4 stripe domain growth is proportional to log t