Fig. 1

Spin wave (SW) and magnonic device. a Simplified schematic diagram shows rotation of a spin in a circular path and its phase (left panel). SWs are the collective precessional motion of localized magnetic spins coupled with short-range exchange and long-range dipolar interactions (right panel). b Schematic illustration shows the basic components of a typical magnonic device. Thin films made of ferromagnetic metals, ferrimagnetic insulators, and antiferromagnets are generally used as SW waveguide, where SWs can be excited by microwave field, spin–orbit torque, pulsed laser beam, and thermal agitation. Those SWs can be detected by various optical or electrical methods. Manipulation and control of SW properties such as frequency, wavevector, phase, group velocity, dispersion character, and guiding SWs through reconfigurable nanochannels are the keys for the development of magnonic devices. SWs can be amplified by compensating damping torque through spin current-induced anti-damping torque