A spin-1/2 model for the Curie temperature of binary superlattices containing alloy disordered interfaces

A. Khater, M. Abou Ghantous, M. Fresneau

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A theoretical model is presented on a simple cubic lattice to determine the Curie temperature phase diagrams for superlattices A2(Ap1 B1-p1)(Ap2 B1-p2)B2. These are considered to consist of periodic cells containing two layers of spin-1/2 A atoms, two layers of spin-1/2 B atoms and alloy disordered (Ap1 B1-p1)(Ap2 B1-p2) double layer interfaces in between, that are characterised by a random arrangement of the A and B atoms. The model is general and can be used for ferro- or anti-ferromagnetic A-B exchange coupling. The A-A and B-B exchange couplings are considered ferromagnetic. An effective field theory is employed to calculate the Curie temperature TC phase diagrams as a function of the two-dimensional (2D) alloy concentrations p1 and p2. The needed superlattice exchange constants are determined by calculating the TC phase diagram for an equivalent bulk alloy and comparing with known experimental data. The theoretical phase diagram results for the considered superlattices are presented for different values of the 2D concentrations and compared with those for a spin-1/2 Ising multilayer superlattice A2(Ap B1-p)B2 with concentrations 0≤p≤1. The concentration dependence of the phase diagram is an important feature of this work allowing a useful experimental analysis of similar systems.

Original languageEnglish
Pages (from-to)305-315
Number of pages11
JournalJournal of Magnetism and Magnetic Materials
Volume247
Issue number3
DOIs
Publication statusPublished - Jun 2002
Externally publishedYes

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Superlattices
Curie temperature
Phase diagrams
superlattices
phase diagrams
Exchange coupling
Atoms
atoms
cubic lattices
Multilayers
cells

Keywords

  • Effective field theory and Ising films
  • Multilayers
  • Phase diagrams
  • Superlattices

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

A spin-1/2 model for the Curie temperature of binary superlattices containing alloy disordered interfaces. / Khater, A.; Ghantous, M. Abou; Fresneau, M.

In: Journal of Magnetism and Magnetic Materials, Vol. 247, No. 3, 06.2002, p. 305-315.

Research output: Contribution to journalArticle

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