In this section, we explore device concepts that utilize magnetic excitations (spin waves, also known as magnons) to carry and process information. These so-called magnonic devices offer the potential for both fast operation and low-power computation—something that is extremely challenging with current microelectronic circuit technologies. Magnonic devices are also well suited for non-Boolean (neuromorphic) information processing and highly interconnected architectures, which are becoming an increasing focus in nanodevice and nanoarchitecture research.