SURFACE MAGNONS IN MAGNETIC SUPERLATTICES

Bulk and surface magnons (spin-waves) in Heisenberg ferromagnetic semi -infinite superlattices are considered theoretically within the interf ace response theory. Each layer is modelled by a simple-cubic lattice of spins coupled via nearest-neighbour exchange interactions. The magn ons have been calculated numerically for superlattices composed of two or three different ferromagnetic materials. We address the question o f surface magnons when the number of atomic planes in the material at the surface is variable.