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Electrodeposition of copper is investigated in localized magnetic fields produced by linear arrays of permanent magnets. The thickness and texture of the deposits depend on the magnitude and direction of the field. The deposition rate is explained in terms of magnetic pressure on the diffusion layer. Addition of non-electroactive GdCl3 to the electrolyte inverts the structuring of the electrodeposits, producing thick dendritic growth in regions where the field is smallest. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]