Phase transition in ultrathin magnetic films with long range interactions

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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.
7 pages, 21 figures

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Computational Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/111804

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/physics/0604067
 http://arxiv.org/abs/physics/0604067

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arXiv