Deterministic creation and deletion of a single magnetic skyrmion observed by direct time-resolved X-ray microscopy

Title
Deterministic creation and deletion of a single magnetic skyrmion observed by direct time-resolved X-ray microscopy
Authors
장준연박민철구현철민병철최준우이기영우성훈송경미Xichao ZhangMotohiko EzawaYan ZhouXiaoxi LiuMarkus WeigandSimone FinizioJorg Raabe
Keywords
Spintronics; Skyrmion
Issue Date
2018-05
Publisher
Nature electronics
Citation
VOL 1-296
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/70205
ISSN
2520-1131
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KIST Publication > Article
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