The phase diagrams and the order parameters of the diluted superlattice with antiferromagnetic interface coupling

• Published in: Journal of magnetism and magnetic materials 2004-05, Vol.271 (2), p.270-285
• Main Authors: Oubelkacem, A., El Aouad, N., Bentaleb, M., Laaboudi, B., Saber, M.
• Format: Article
• Language: English
• Subjects: Compensation temperature; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical phenomena; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Ising model; Magnetic properties and materials; Materials science; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Studies of specific magnetic materials
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2003.09.050

Using the effective field theory with a probability distribution technique that accounts for the self-spin correlation functions, the magnetic properties of the diluted Ising superlattice consisting of two ferromagnetic materials A and B, with L a layers of diluted spins S a= 1 2 and L b layers of diluted spins S b=1 with antiferromagnetic interface coupling are examined. For fixed values of the reduced exchange interactions and the concentration c of magnetic atoms, the phase diagrams, the two sublattice magnetizations and the total magnetization for the superlattice with the same spin S a=S b= 1 2 and for S a= 1 2 , S b =1 are studied as a function of the temperature. We find a number of characteristic phenomena. In particular, the effect of the concentration c of magnetic atoms, the interlayer coupling and the layer thickness on both the compensation temperature and the magnetization profiles are clarified.