Topological transformation of synthetic ferromagnetic skyrmions: thermal assisted switching of helicity by spin-orbit torque

Kai Wu, Yuelei Zhao, Hongyuan Hao, Sheng Yang, Shuang Li, Qingfang Liu, Senfu Zhang (), Xixiang Zhang, Johan Åkerman, Li Xi, Ying Zhang, Kaiming Cai and Yan Zhou ()
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Kai Wu: The Chinese University of Hong Kong, Shenzhen
Yuelei Zhao: The Chinese University of Hong Kong, Shenzhen
Hongyuan Hao: Lanzhou University
Sheng Yang: The Chinese University of Hong Kong, Shenzhen
Shuang Li: The Chinese University of Hong Kong, Shenzhen
Qingfang Liu: Lanzhou University
Senfu Zhang: Lanzhou University
Xixiang Zhang: King Abdullah University of Science and Technology
Johan Åkerman: University of Gothenburg
Li Xi: Lanzhou University
Ying Zhang: Chinese Academy of Sciences
Kaiming Cai: Huazhong University of Science and Technology
Yan Zhou: The Chinese University of Hong Kong, Shenzhen

Nature Communications, 2024, vol. 15, issue 1, 1-6

Abstract: Abstract This study demonstrates the controllable switching of skyrmion helicity using spin-orbit torque, enhanced by thermal effects. Electric current pulses applied to a [Pt/Co]3/Ru/[Co/Pt]3 multilayer stripe drive skyrmions in a direction opposite to the current flow. Continuous pulsing results in an unexpected reversal of skyrmion motion. Micromagnetic simulations reveal that skyrmions in the upper and lower ferromagnetic layers exhibit distinct helicities, forming a hybrid synthetic skyrmion. The helicity switch of this hybrid structure accounts for the motion reversal. This study introduces innovative helicity control methods, advancing spintronic device applications, including data storage and quantum computing based on skyrmion helicity.

Date: 2024
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DOI: 10.1038/s41467-024-54851-5

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