Spherical Model for Anisotropic Ferromagnetic Films
D. A. Garanin
Abstract
The corrections to the Curie temperature Tc of a ferromagnetic film consisting of N layers are calculated for N 1 for the model of D-component classical spin vectors in the limit D ∞, which is exactly soluble and close to the spherical model. The present approach accounts, however, for the magnetic anisotropy playing the crucial role in the crossover from 3 to 2 dimensions in magnetic films. In the spatially inhomogeneous case with free boundary conditions the D=∞ model is nonequivalent to the standard spherical one and always leads to the diminishing of Tc(N) relative to the bulk.
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