Current-induced localized spin wave interference in a ferromagnetic nanowire with a domain wall

Spin wave dispersion relations in a ferromagnetic nanowire with and without a domain wall are investigated by means of micromagnetic simulations. We confirm that the spin wave dispersion relation is shifted due to the spin wave Doppler effects, when the spin-transfer torque is applied. We also investigate the position-dependent ferromagnetic resonance spectra in the nanowire and find strong local spin wave interferences because of the formation of the standing wave due to reflections from a domain wall. It is observed that the spacing between the local spin wave constructive interferences is uniform, and it is revealed that the spacing is related with the spin wave Doppler shift.

► We study the spin wave dispersion relation in a ferromagnetic nanowire.
► The position-dependent ferromagnetic resonance spectra are investigated in nanowire.
► The spin wave Doppler effects and strong local spin wave interferences are found.
► The spacing between the local spin wave constructive interferences is uniform.
► The spacing is related to the spin wave Doppler shift.