Spin-transfer-driven spin-waves excitation in a finite-size magnetic waveguide

The current-driven excitation of spin-waves in a one-dimensional magnetic waveguide is examined analytically and numerically. The proposed model accounts for the interference between incident and reflected waves caused by the finite sizes of the physical domain. This effect is relevant in experiments where the demand of miniaturization leads the spin-wave decay length to be of the same scale as the extents of the structures. Particular analytical solutions of the linearized equation for the spin-wave amplitude are found for elongated and contracted nanocontacts. These solutions are compared to those of an infinite waveguide and are also successfully validated through micromagnetic simulations.