Deterministic creation and deletion of a single magnetic skyrmion observed by direct time-resolved X-ray microscopy
- Deterministic creation and deletion of a single magnetic skyrmion observed by direct time-resolved X-ray microscopy
- 장준연; 박민철; 구현철; 민병철; 최준우; 이기영; 우성훈; 송경미; Xichao Zhang; Motohiko Ezawa; Yan Zhou; Xiaoxi Liu; Markus Weigand; Simone Finizio; Jorg Raabe
- Spintronics; Skyrmion
- Issue Date
- Nature electronics
- VOL 1-296
- Spintronic devices based on magnetic skyrmions are a promising candidate for next-generation memory applications due to their nanometre size, topologically protected stability and efficient current-driven dynamics. Since the recent discovery of roomtemperature magnetic skyrmions, there have been reports of current-driven skyrmion displacement on magnetic tracks and
demonstrations of current pulse-driven skyrmion generation. However, the controlled annihilation of a single skyrmion at room temperature has remained elusive. Here we demonstrate the deterministic writing and deleting of single isolated skyrmions at room temperature in ferrimagnetic GdFeCo films with a device-compatible stripline geometry. The process is driven by the application of current pulses, which induce spin– orbit torques, and is directly observed using a time-resolved nanoscale X-ray imaging technique. We provide a current pulse profile for the efficient and deterministic writing and deleting process. Using micromagnetic simulations, we also reveal the microscopic mechanism of the topological fluctuations that occur during this process.
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