화학공학소재연구정보센터
Applied Surface Science, Vol.258, No.6, 1902-1909, 2012
Phase transition in Ising, XY and Heisenberg magnetic films
The phase transition and magnetic properties of a ferromagnet spin-S, a disordered diluted thin and semi-infinite film with a face-centered cubic lattice are investigated using the high-temperature series expansions technique extrapolated with Pade approximants method for Heisenberg, XY and Ising models. The reduced critical temperature of the system tau(c) is studied as function of the thickness of the thin film and the exchange interactions in the bulk, and within the surfaces J(b), J(s) and J(perpendicular to), respectively. It is found that tau(c) increases with the exchange interactions of surface. The magnetic phase diagrams (tau(c) versus the dilution x) and the percolation threshold are obtained. The shifts of the critical temperatures T-c(l) from the bulk value (T-c(infinity)/T-c(l) - 1) can be described by a power law l(-lambda), where lambda = 1/upsilon is the inverse of the correlation length exponent. (C) 2011 Elsevier B. V. All rights reserved.