Special topic on phonon–magnon interactions: From fundamentals to device physics

Phonons and magnons are collective excitations in solids that provide charge-free platforms for information transport. Phonons are distinguished by their robustness and long coherence times, while magnons offer wide frequency tunability, enabling energy-efficient and high-speed operation. Growing interest has, therefore, focused on materials, metamaterials, and devices that enable the observation and control of magnon–phonon interactions, as their coupling allows complementary properties to be combined and gives rise to novel physical effects. These developments hold strong potential for analog, digital, and quantum information technologies at microwave frequencies. This Special Topic aims to gather recent advances spanning experimental techniques, materials and engineered systems, theoretical concepts, and modeling approaches that advance the understanding and exploitation of coupled magnonic and phononic phenomena.