  The propagation of edge localized spin waves (E-SWs) in yttrium iron garnet
(YIG) microstripes with/without the proximate magnetic microstructures is
investigated by micromagnetic simulations. A splitting of the dispersion curve
with the presence of permalloy (Py) stripe is also observed. The E-SWs on the
two edges of YIG stripe have different wavelengths, group velocities, and decay
lengths at the same frequencies. The role of the Py stripe was found to be the
source of the inhomogeneous static dipolar field without dynamic coupling with
YIG. This work opens new perspectives for the design of innovative SW
interference-based logic devices.
