Quantum-optical analogies using photonic structures. Coherent coupling between a ferromagnetic magnon and a superconducting qubit. Spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides. All-linear time reversal by a dynamic artificial crystal. Topological chiral magnonic edge mode in a magnonic crystal. Bullets and droplets: two-dimensional spin-wave solitons in modern magnonics. Magnon transistor for all-magnon data processing. Long-distance transport of magnon spin information in a magnetic insulator at room temperature.
Spin superfluidity and long-range transport in thin-film ferromagnets. Hybrid magnonics: physics, circuits, and applications for coherent information processing. Perspectives of using spin waves for computing and signal processing. Interference of coherent spin waves in micron-sized ferromagnetic waveguides. Bogoliubov waves and distant transport of magnon condensate at room temperature. Spatially non-uniform ground state and quantized vortices in a two-component Bose-Einstein condensate of magnons. Nowik-Boltyk, P., Dzyapko, O., Demidov, V. Generation of coherent spin-wave modes in yttrium iron garnet microdiscs by spin–orbit torque. A single layer spin-orbit torque nano-oscillator. Tunable space-time crystal in room-temperature magnetodielectrics. Magnetization Oscillations and Waves (CRC, 1996). Spin current as a probe of quantum materials. Novel coherent states of matter, such as magnon Bose–Einstein condensates, enable a broad range of additional applications. Thus, the field of magnonics is well suited for the implementation of wave-based computing devices, combining the excellent versatility, smallness, nonlinearity and external control it affords. Coherency enables, for instance, the design of interference-based, wave processing spin-wave devices. In this Review, we address specifically coherent spin waves. Spin waves may be generated with varying degrees of coherency, depending on the excitation method, and transport mechanisms range from diffusive to ballistic. They can be confined and guided, and they can be amplified. Spin waves are easily driven into the nonlinear regime. The physics of spin waves is very rich, ranging from a coexistence between dipole–dipole interaction and symmetric and antisymmetric exchange interaction, to various types of interface effects, anisotropies and spin torques. These excitations, referred to as spin waves and their quanta, magnons, are a powerful tool for information transport and processing on the microscale and nanoscale. Magnonics addresses the dynamic excitations of a magnetically ordered material.
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