Racetrack geometries provide a versatile framework for the creation of stable, nanometer‐scale magnetic skyrmions that possess potential for future spintronic applications. For memory device applications, comprehension of the energy dynamics regulating the stability of an isolated skyrmion in environments abundant with defects is crucial. This study examines the temporal and spatial evolution of exchange, anisotropy, and total energy contributions during the current‐generated motion of an isolated skyrmion in a racetrack with defects both smaller and greater than the size of skyrmion. Using micromagnetic simulations, we show that the behavior of the exchange energy is independent of defect size, exhibiting a temporal increase with defect number, while its spatial variation is governed by local skyrmion–defect interactions. In contrast, the anisotropy energy is defect‐size dependent: For small defects, it is controlled by local skyrmion–defect interactions, whereas for large defects, it scales with the number of defects. The presence of defects leads to a higher total energy compared to a defect‐free racetrack. Small defects act as low‐energy pinning sites, while large defects induce global deformation and must be carefully optimized for efficient skyrmion transport.
Kamal et al. (Sun,) studied this question.