Magnetization curves of a spin- 1 2 bilayer system (A2) (ApB1-p)1 (B)2 with disordered interfaces

M. Fresneau, G. Le Gal, A. Khater

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Abstract

A calculation is presented for the component magnetizations of an infinite multilayer Ising system, consisting periodically of two layers of spin- 1 2 A ions, two layers of spin- 1 2 B ions, and a disordered layer interface in between that is characterized by a random arrangement of A and B ions like a two-dimensional ApB1-p alloy. The system is a simple cubic Ising-type structure with a coordination number z = 6. The model is general for ferro- and for antiferromagnetic A-B exchange couplings. The A-A and B-B exchange couplings are regarded as ferromagnetic. An effective field theory that goes beyond mean field, is employed to calculate the bulk-like transition temperature, the different component magnetizations as well as the total bulk-like magnetization. The component magnetizations are calculated for different realistic model values of ferro- and antiferromagnetic A-B exchange constants, as a function of temperature and of the concentration parameter p that characterizes the disorder in the interface. We show that the presence of a disordered interface may significantly affect the component and total magnetizations. In particular, for the case of antiferromagnetic exchange couplings, it is shown that the system can acquire a compensation temperature for certain domains of values of the concentration parameter p in the disordered interface.

Original languageEnglish
Pages (from-to)63-72
Number of pages10
JournalJournal of Magnetism and Magnetic Materials
Volume130
Issue number1-3
DOIs
Publication statusPublished - 1994
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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