Phase transition in ultrathin magnetic films with long range interactions

Details Phase transition in ultrathin magnetic films with long range interactions Phase transition in ultrathin magnetic films with long range interactions

2006-04-08

arxiv.org/abs/physics/0604067v1

Physics

Computational Physics

7 pages, 21 figures

Scientific paper

Ultrathin magnetic films can be modeled as an anisotropic Heisenberg model with long range dipolar interactions. It is believed that the phase diagram presents three phases: A ordered ferromagnetic phase (I), a phase characterized by a change from out-of-plane to in-plane in the magnetization (II), and a high temperature paramagnetic phase (III). It is claimed that the border lines from phase I to III and II to III are of second order and from I to II is first order. In the present work we have performed a very careful Monte Carlo simulation of the model. Our results strongly support that the line separating phase II and III is of the BKT type.

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