Abstract
We extend a previous model of a semi-infinite Ising ferromagnet with anisotropy so as to incorporate not only the surface effects on. anisotropy, but also those on exchange couplings into the model. The phase diagrams and the ordering temperatures for the surface magnetism of this extended model are examined by a new effective-field theory. The pevious result that the surface cannot order before the bulk does when we take no account of the surface effects on the exchange couplings can be seen more clearly in those diagrams. The results obtained by a usual molecular-field theory are also given to compare with those of the effective-field theory.
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