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Single skyrmion true random number generator using local dynamics and interaction between skyrmions

Author

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  • Kang Wang

    (Brown University)

  • Yiou Zhang

    (Brown University)

  • Vineetha Bheemarasetty

    (Brown University)

  • Shiyu Zhou

    (Brown University)

  • See-Chen Ying

    (Brown University)

  • Gang Xiao

    (Brown University)

Abstract

Magnetic skyrmions are of great interest to both fundamental research and applications in post-von-Neumann computing devices. The successful implementation of skyrmionic devices requires functionalities of skyrmions with effective controls. Here we show that the local dynamics of skyrmions, in contrast to the global dynamics of a skyrmion as a whole, can be introduced to provide effective functionalities for versatile computing. A single skyrmion interacting with local pinning centres under thermal effects can fluctuate in time and switch between a small-skyrmion and a large-skyrmion state, thereby serving as a robust true random number generator for probabilistic computing. Moreover, neighbouring skyrmions exhibit an anti-correlated coupling in their fluctuation dynamics. Both the switching probability and the dynamic coupling strength can be tuned by modifying the applied magnetic field and spin current. Our results could lead to progress in developing magnetic skyrmionic devices with high tunability and efficient controls.

Suggested Citation

  • Kang Wang & Yiou Zhang & Vineetha Bheemarasetty & Shiyu Zhou & See-Chen Ying & Gang Xiao, 2022. "Single skyrmion true random number generator using local dynamics and interaction between skyrmions," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28334-4
    DOI: 10.1038/s41467-022-28334-4
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