Magnonic bandstucture in a skyrmion crystal

This paper presents the first realization of a skyrmion-based dynamic magnonic crystal (SDMC) and numerically explore the features of the magnonic spectra of spin waves in it. The SDMC is based on a perpendicularly magnetized Co/Pt waveguide with the presence of interfacial Dzyaloshinskii-Moriya interaction. The magnetic periodicity of the waveguide is realized by the presence of a spatially periodic array of skyrmions, whose properties are dynamically controllable by the perpendicularly applied magnetic field. Results show that the strength of perpendicularly applied magnetic field plays an important role in determining the size of the skyrmions, and hence the periodic magnetization property of the magnonic waveguide.