Circular phase of a two dimensional ferromagnet with dipolar interactions
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We make for the first time a large-scale Monte-Carlo simulation of a ferromagnetic Heisenberg model with dipolar interactions on a two dimensional square lattice with open boundaries using an efficient new technique. We find that a phase transition occurs in the model and the ordered phase is characterized by a circular arrangement of the spins.
8 pages, REVTex, 1 figure(Fig.1) availale upon request 5 figures(Fig.2-6) in ps-files uuencoded
8 pages, REVTex, 1 figure(Fig.1) availale upon request 5 figures(Fig.2-6) in ps-files uuencoded