Abstract
A brief study of bulk and surface magnons in 3-layer Heisenberg ferromagnetic superlatices is presented. Each layer is modelled by a simple-cubic lattice of spins coupled via nearest-neighbor exchange interactions. The superlattice has a larger periodicity in the direction perpendicular to the slabs and therefore many magnon branches in the folded Brillouin zone. In the gaps existing between these magnon branches appear the surface-localized magnons. We give closed-form expressions for bulk and surface magnons in 3-layer superlattices, together with the corresponding dispersion curves for one specific case. An application is also done for a Fe/Co superlattice
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