We modified the recently proposed multicanonical MC algorithm for the case of a magnetic field driven order--order phase transition. We test this { \it multimagnetic} Monte Carlo algorithm for the D=2 Ising model at $\beta=0.5$ and simulate square lattices up to size $100 \times 100$. On these lattices with periodic boundary conditions it is possible to enhance the appearance of order-order interfaces during the simulation by many orders of magnitude as compared to the standard Monte Carlo simulation.
Categories: hep-lat