Research Abstract


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

2018年5月14日 Nature Electronics 1 : 5 doi: 10.1038/s41928-018-0070-8



Seonghoon Woo, Kyung Mee Song, Xichao Zhang, Motohiko Ezawa, Yan Zhou, Xiaoxi Liu, Markus Weigand, Simone Finizio, Jörg Raabe, Min-Chul Park, Ki-Young Lee, Jun Woo Choi, Byoung-Chul Min, Hyun Cheol Koo and Joonyeon Chang

Corresponding Author

Seonghoon Woo

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 room-temperature 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.