Phase diagrams and magnetic properties of Ising thin film Part I: Re-entrant phenomena in an amorphous thin film

An amorphous Ising film is investigated by the use of an effective field th eory. The phase diagrams in (T, delta) plane, are studied for some values o f n (number of layers). We found that the transition temperature of the him decreases when the disorder parameter delta increases. The re-entrant phen omena are observed for delta > 1 and n less than or equal to 6. Magnetizati on curves of the system are studied in some regions of 6 where these phenom ena are manifested. The first-order transitions have been observed for n le ss than or equal to 4 and delta > 1. (C) 2000 Elsevier Science B.V. All rig hts reserved.