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Phase Diagram of Spin‐1/2 Ising Semi‐Infinite and Film Ferromagnets with Spin‐3/2 Overlayers
Author(s) -
Bentaleb M.,
El Aouad N.,
Saber M.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200206)231:2<529::aid-pssb529>3.0.co;2-7
Subject(s) - condensed matter physics , phase diagram , ising model , ferromagnetism , magnetism , spin (aerodynamics) , anisotropy , surface (topology) , phase (matter) , materials science , physics , quantum mechanics , thermodynamics , mathematics , geometry
Within the framework of the effective field theory, we examine the phase diagrams of a spin‐1/2 Ising film, with a spin‐3/2 atoms on the top and bottom surfaces, and the corresponding semi‐infinite system. In particular, the effects of surface single‐ion anisotropy on the phase diagram and critical value for surface ordering are clarified. The system shows the existence of a critical value of the ratio of the surface interaction to the bulk one above which the surface magnetism appears. This critical value moves to lower values when D s increases. The critical surface temperature exhibits a characteristic behavior namely when large negative D s are selected.