Reaction-field approximation for the semi-infinite Ising ferromagnet with surface amorphization: phase diagrams

Using a reaction-field approximation that includes non-trivial spin fluctuation effects, we have studied the magnetic properties of the semi-infinite simple cubic spin- 1 2 Ising ferromagnet with a free surface and with three different exchange parameters ( J S couples surface spins, J 1 is the exch...

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Bibliographic Details
Published in:Surface science 1996-09, Vol.365 (1), p.168-176
Main Author: ILLKOVIC, V
Format: Article
Language:English
Subjects:
Amorphous surfaces
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Ising models
Magnetic properties and materials
Magnetic properties of surface, thin films and multilayers
Phase transitions
Physics
Surface magnetism
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Summary:Using a reaction-field approximation that includes non-trivial spin fluctuation effects, we have studied the magnetic properties of the semi-infinite simple cubic spin- 1 2 Ising ferromagnet with a free surface and with three different exchange parameters ( J S couples surface spins, J 1 is the exchange interaction between spins in the surface and in the first (next) layer, and J B is the interaction in the bulk); J S and J 1 are assumed to be randomly distributed. We find a number of characteristic behaviours for the surface magnetic properties such as the possibility of the surface re-entrant phenomenon.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(96)00683-8