  Spin waves (magnons) can enable wave-based neuromorphic computing by which
one aims at overcoming limitations inherent to conventional electronics and the
von Neumann architecture. In this study, we explore the storage of magnon
signals and the magnetization switching of periodic and aperiodic arrays of
Ni81Fe19 (Py) nanostripes with widths (w) between 50 nm and 200 nm. Spin waves
excited with low microwave power in yttrium iron garnet induce the reversal of
the nanostripes of different w in a small opposing field. Exploiting
microwave-to-magnon transducers for magnon modes with ultrashort wavelengths,
we demonstrate the reversal of 50-nm-wide Py nanostripes by magnons with
wavelength ~ 100 nm after they have propagated over 25 micrometer in YIG. The
findings are important for designing a magnon-based in-memory computing device.
