Phase Diagrams and Magnetic Behaviour of Films with Amorphous Surfaces

Abstract

The phase diagrams and magnetic behaviour of thin films with two amorphized surfaces are investigated by the use of the effective field theory with correlations. The transition temperature dependence of the exchange integral at surfaces, coupling between surface and nearest-layer, film thickness, and structural fluctuations are studied. Some interesting phenomena can occur as wetting phenomenon and compensation point.

Effects of Amorphization and Anisotropy in Surfaces of Thin Films

“…In a series of works, Kaneyoshi et al have studied amorphized systems, amongst them semi-inÐnite Ising model with surface amorphization [29,30], a transverse Ising model with a surface amorphization [31], a semi-inÐnite Ising model with a nonrandom surface or surface amorphization [32]. The magnetic properties of a thin Ðlm with two amorphized surfaces [33] and an inÐnite Ising-type amorphized structure [34,35] have also been investigated.…”

The effects of nearest- and next-nearest neighbor interactions on the magnetic properties of films with BCC structure

“…Fig. 3 (a) and (b) show the transition phase diagrams of the surface and the inner layers with both TM and MC methods for the (3,3,3) …”

“…In this regard, many approaches such as the effective field theory [3], and Monte Carlo simulation [4] have been developed. However, most of the works related with magnetic films have been devoted to the nearest-neighbor (NN) exchange interaction and few works deal with the next-nearest neighbor (NNN) one.…”

Mean-field and high temperature series expansion calculations of some magnetic properties of Ising and XY antiferromagnetic thin-films

“…Recently, the critical behaviours of magnetic films are of great interest. [1,2] In this regard, many approaches such as the effective field theory [3] and Monte Carlo (MC) simulation [4] have been developed. However, most of the studies relating to magnetic films have been devoted to the nearest-neighbour (NN) exchange interaction and few studies have dealt with the next-nearest neighbour (NNN).…”