Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 358, Issue 1, Pages 86-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physa.2005.06.008
Keywords
Monte Carlo; surface field; thin film; random field; layering transitions
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The effect of a random surface field, within the bimodal distribution, on the layering transitions in a spin-1/2 Ising thin film is investigated using Monte Carlo simulations. It is found that the layering transitions depend strongly on the concentration p of the disorder of the surface magnetic field, for a fixed temperature, surface and external magnetic fields. Indeed, the critical concentration p(c)(k) at which the magnetisation of each layer k changes the sign discontinuously, decreases with increase in applied surface magnetic field, for fixed values of the temperature T and the external magnetic field H. Moreover, the behaviour of the layer magnetisations as well as the distribution of positive and negative spins in each layer, are also established for specific values of H-s, H, p and temperature T. (c) 2005 Elsevier B.V. All rights reserved.
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