Magnonics is a budding research field in nanomagnetism and nanoscience that addresses the use of spin waves (magnons) to transmit, store, and process information. The rapid advancements of this field during last one decade in terms of upsurge in research papers, review articles, citations, proposals of devices as well as introduction of new sub-topics prompted us to present the first Roadmap on Magnonics. This a collection of 22 sections written by leading experts in this field who review and discuss the current status besides presenting their vision of future perspectives. Today, the principal challenges in applied magnonics are the excitation of sub-100 nm wavelength magnons, their manipulation on the nanoscale and the creation of sub-micrometre devices using low-Gilbert damping magnetic materials and its interconnections to standard electronics. To this end, magnonics offers lower energy consumption, easier integrability and compatibility with CMOS structure, reprogrammability, shorter wavelength, smaller device features, anisotropic properties, negative group velocity, non-reciprocity and efficient tunability by various external stimuli to name a few. Hence, despite being a young research field, magnonics has come a long way since its early inception. This Roadmap asserts a milestone for future emerging research directions in magnonics, and hopefully, it will inspire a series of exciting new articles on the same topic in the coming years.

We observe and explain theoretically strain-induced spin-wave routing in the bilateral composite multilayer. By means of Brillouin light scattering and microwave spectroscopy, we study the spin-wave transport across three adjacent magnonic stripes, which are strain coupled to a piezoelectric layer. The strain may effectively induce voltage-controlled dipolar spin-wave interactions. We experimentally demonstrate the basic features of the voltage-controlled spin-wave switching. We show that the spin-wave characteristics can be tuned with an electrical field due to piezoelectricity and magnetostriction of the piezolayer and layered composite and mechanical coupling between them. Our experimental observations agree with numerical calculations.

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We report experimental investigation of spin-wave transport along combined magnonic structures which are comprised of the 90°-magnonic bend and adjacent nonidentical magnetic stripes. The latter has the form of a spin-wave coupler. Using space-resolved Brillouin light-scattering spectroscopy and micromagnetic simulations, we study propagation, transformation, and coupling of spin waves in the combined structure. We show that characteristics of spin-wave transport in such structures are defined strongly by the intermodal dipolar spin-wave coupling. The developed structure can operate as a multifunctional magnonic device and can be used to turn the spin wave at 90° performing the functionality of a directional coupler, a power splitter, a multiplexer, or a frequency separator. Our results show that interconnection of magnonic units can be utilized for further development of planar topologies of insulator-based magnonic networks.

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