Theoretical studies by Hinchey and Mills [J. Appl. Phys. 57, 3687 (1985)] on the basic properties of magnetic superlattice structures formed from alternating layers of ferromagnetic and antiferromagnetic materials have revealed a number of fascinating results. In their model, the antiferromagnet consists of sheets parallel to each interface within which the spins are aligned ferromagnetically. A localized spin model with only nearest-neighbor interaction is assumed. In this work we work with the same model, but in the absence of an applied magnetic field. The low temperature magnetic properties are investigated theoretically within the spin-wave approximation. For arbitrary thicknesses of ferromagnetic and antiferromagnetic layers, an expression which determines the dispersion relation for the spin-wave modes is obtained. The transformation from spin deviations variables to these modes is also computed explicitly.
ASJC Scopus subject areas
- Physics and Astronomy(all)