  Low dissipation data processing with spins is one of the promising directions
for future information and communication technologies. Despite a signifcant
progress, the available magnonic devices are not broadband yet and have
restricted capabilities to redirect spin waves. Here we propose a breakthrough
approach to the spin wave manipulation in patterned magnetic nanostructures
with unmatched characteristics, which exploits spin waves analogous to edge
waves propagating along a water-wall boundary. Using theory, micromagnetic
simulations and experiment we investigate spin waves propagating along the
edges in magnetic structures, under an in-plane DC magnetic field inclined with
respect to the edge. The proposed edge spin waves overcome important challenges
faced by previous technologies such as the manipulation of the spin wave
propagation direction, and they substantially improve the capability of
transmitting information at frequencies exceeding 10 GHz. The concept of the
edge spin waves allows to design broad range of logic devices such as
splitters, interferometers, or edge spin wave transistors with unprecedented
characteristics and potentially strong impact on information technologies.
