Magnetic Surface Enhancement and the Curie Temperature in Ising Thin Films
We study the magnetic surface enhancement and the Curie temperature in ferromagnetic Ising thin films as a function of the surface orientations and structure. We use a simplified version of the cluster variation method in the pair approximation that only considers as inequivalent those sites on the surface, while all the internal sites are considered as equivalent regardless of the position. We calculate the critical value of the surface interaction J SC , beyond which the surface dominates the magnetic properties of the system. Our results are in agreement with those of the reaction field approximation and the renormalization group theory for the case of simple cubic lattice thin films.
KeywordsCritical Temperature Curie Temperature Surface Interaction Surface Orientation Internal Site
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