Annihilation of skyrmions by spin wave in crossbar geometry*

Magnetic Skyrmions are possible candidates for future information storage applications due to their small size and topological protection. Understanding of the creation and annihilation process is necessary for developing a Skyrmion-based technology. We theoretically study the annihilation process within a crossbar geometry. By micromagnetic simulation, we find the annihilation of a single Skyrmion can be achieved by injecting a spin wave. The influence of a defect in this system is also discussed. Our method could be applied to individually address arrays of Skyrmions in a memory architechture.