Abstract
The channeling of spin waves with domain walls in ultrathin ferromagnetic films is demonstrated theoretically and through micromagnetics simulations. It is shown that propagating excitations localized to the wall, which appear in the frequency gap of bulk spin wave modes, can be guided in curved geometries and propagate in close proximity to other channels. For Néel-type walls arising from a Dzyaloshinskii-Moriya interaction, the channeling is strongly nonreciprocal and group velocities can exceed 1 km/s in the long wavelength limit for certain propagation directions. The channeled modes represent an unusual analogy of whispering gallery waves that are one dimensional and nonreciprocal with this interaction. Moreover, a sufficiently strong Dzyaloshinskii-Moriya interaction can create a degeneracy of channeled and propagating modes at a critical wave vector.
Highlights
Surfaces and boundaries are natural elements along which propagating waves can become localized
It is shown that propagating excitations localized to the wall, which appear in the frequency gap of bulk spin wave modes, can be guided in curved geometries and propagate in close proximity to other channels
For Néel-type walls arising from a DzyaloshinskiiMoriya interaction, the channeling is strongly nonreciprocal and group velocities can exceed 1 km=s in the long wavelength limit for certain propagation directions
Summary
Surfaces and boundaries are natural elements along which propagating waves can become localized. Felipe Garcia-Sanchez,1,* Pablo Borys,2 Rémy Soucaille,1 Jean-Paul Adam,1 Robert L.
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