All-magnetic control of skyrmions in nanowire by spin wave

A skyrmion is a topological particle-like excitation in classical continuum field theory. Skyr-mion can be driven by spin-polarized current. However, to move the skyrmion along the central line of a nanotrack by in-plane spin-polarized current requires severe matching between the damping coefficient and the non-adiabatic coefficient, i.e. α is close to β, limiting possible material systems for skyrmion applications. Another possibility of controlling a skyrmion is to use spin wave. Spin wave produces less heat than electric current, which therefore is promising for practical applications. We investigate the skyrmion dynamics driven by spin wave in constricted geometries with the Dzyaloshinskii-Moriya interaction (DMI) such as nanotracks, L-corners, T- and Y-junctions, which are the basic ingredients of circuits based on skyrmions.