Abstract
The anisotropic Blume-Emery-Griffiths (B-E-G) model with single-ion anisotropy and biquadratic interactions has been applied for the description of very thin magnetic films with S = 1. According to the Bogolyubov minimisation principle, the expression for the Gibbs free energy has been derived in the frame of the Molecular Field Approximation (MFA), as a basis from which all thermodynamic properties can be studied. In particular, the method has been employed to study the phase diagrams of a double layer. The numerical results are presented in figures and a discussion is given.
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