Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors that covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with Boolean digital data, unconventional approaches like neuromorphic computing, and the progress towards magnon-based quantum computing. The article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.
Reconfigurable magnetization textures offer control of
spin waves
with promising properties for future low-power beyond-CMOS systems.
However, materials with perpendicular magnetic anisotropy (PMA) suitable
for stable magnetization-texture formation are characterized by high
damping, which limits their applicability in magnonic devices. Here,
we propose to overcome this limitation by using hybrid structures,
i.e., a PMA layer magnetostatically coupled to a low-damping soft
ferromagnetic film. We experimentally show that a periodic stripe-domain
texture from a PMA layer is imprinted upon the soft layer and induces
a nonreciprocal dispersion relation of the spin waves confined to
the low-damping film. Moreover, an asymmetric bandgap features the
spin-wave band diagram, which is a clear demonstration of collective
spin-wave dynamics, a property characteristic for magnonic crystals
with broken time-reversal symmetry. The composite character of the
hybrid structure allows for stabilization of two magnetic states at
remanence, with parallel and antiparallel orientation of net magnetization
in hard and soft layers. The states can be switched using a low external
magnetic field; therefore, the proposed system obtains an additional
functionality of state reconfigurability. This study offers a link
between reconfigurable magnetization textures and low-damping spin-wave
dynamics, providing an opportunity to create miniaturized, programmable,
and energy-efficient signal processing devices operating at high frequencies.
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