A study of the magnon contribution to the properties of the [Ni1−xFex/Cu] alloy super-lattices

Abstract The magnetic excitation properties in the [Ni 1− x Fe x /Cu] alloy super-lattices with 0 ⩽ x ⩽ 0.2 and x = 1 are investigated within the linear spin wave theory framework. The excitation spectra and the magnetization are calculated using Green's function method. The results show that for each wave vector value there are N coupled modes for a super lattice with N planes. The alloying effect leads to an exchange and magnetic stability reinforcement, as confirmed by the exchange integral values deduced from a satisfactory comparison between the calculated magnetization and the measured one in presence of an applied magnetic field.