The article "Magnonics" by V. V. Kruglyak, S. O. Demokritov, and D. Grundler provides an overview of the emerging field of magnonics, which combines spin dynamics with nanoscale science and technology. The authors review the foundational concepts and recent achievements in magnonics, highlighting the potential for future applications. They discuss the challenges that need to be addressed to make magnonics a pervasive technology, emphasizing the unique properties of spin waves and the importance of nanostructured materials. Key points include: - The historical development of spin wave theory and experimental evidence. - The diverse applications of spin waves, such as in spintronics and magnetic data storage. - The potential of magnonic devices for information processing and their integration with microwave electronics and photonic devices. - The fabrication and functionality of magnonic devices, including waveguides, logic gates, and interferometers. - The role of magnonic crystals in controlling the propagation and interaction of spin waves. - Techniques for exciting and detecting spin waves, such as ferromagnetic resonance (FMR), Brillouin light scattering (BLS), and magneto-optical techniques. - Challenges in nano-fabrication and materials research, particularly the need for low damping materials and advanced nano-manufacturing techniques. The article concludes by discussing future directions, including the integration of magnonic devices with other technologies and the exploration of new materials and fabrication methods.The article "Magnonics" by V. V. Kruglyak, S. O. Demokritov, and D. Grundler provides an overview of the emerging field of magnonics, which combines spin dynamics with nanoscale science and technology. The authors review the foundational concepts and recent achievements in magnonics, highlighting the potential for future applications. They discuss the challenges that need to be addressed to make magnonics a pervasive technology, emphasizing the unique properties of spin waves and the importance of nanostructured materials. Key points include: - The historical development of spin wave theory and experimental evidence. - The diverse applications of spin waves, such as in spintronics and magnetic data storage. - The potential of magnonic devices for information processing and their integration with microwave electronics and photonic devices. - The fabrication and functionality of magnonic devices, including waveguides, logic gates, and interferometers. - The role of magnonic crystals in controlling the propagation and interaction of spin waves. - Techniques for exciting and detecting spin waves, such as ferromagnetic resonance (FMR), Brillouin light scattering (BLS), and magneto-optical techniques. - Challenges in nano-fabrication and materials research, particularly the need for low damping materials and advanced nano-manufacturing techniques. The article concludes by discussing future directions, including the integration of magnonic devices with other technologies and the exploration of new materials and fabrication methods.