KAIST nanophotonics
김재유
물리학과 석박통합과정
Photo-thermal control of individual magnetic skyrmions
Magnetic skyrmions are vortex-like spin configurations observed in various magnetic materials. Due to the topological protection, skyrmions are stable and robust to external surroundings. From this feature, skyrmion is a promising candidate for future memory, logic, or neuromorphic devices. On the other hand, skyrmions are also quasi-particles interacting with adjacent domain walls or other skyrmions. However, conventional manipulation techniques using current pulses face challenges in controlling individual skyrmions and studying their interactions. In this study, we propose a simple method for the individual control of magnetic skyrmions using laser-induced photo-thermal effects. By generating a local temperature gradient through photo-thermal heating, we effectively reduce the energy density of magnetic domain walls. This results in the attraction of domain walls and skyrmions towards the laser spot. We investigated the photo-thermal dragging of the skyrmions along the beam sweeping and trapping of skyrmions against the electrical current. Our findings suggest that this photo-thermal control approach holds great potential for realizing novel skyrmionic devices and advancing our understanding of the many-body physics of skyrmions.