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Magnetic droplet soliton pairs

Author

Listed:
  • S. Jiang

    (South China University of Technology
    University of Gothenburg)

  • S. Chung

    (University of Gothenburg
    Korea National University of Education)

  • M. Ahlberg

    (University of Gothenburg)

  • A. Frisk

    (University of Gothenburg)

  • R. Khymyn

    (University of Gothenburg)

  • Q. Tuan Le

    (University of Gothenburg
    KTH Royal Institute of Technology)

  • H. Mazraati

    (KTH Royal Institute of Technology)

  • A. Houshang

    (University of Gothenburg)

  • O. Heinonen

    (Argonne National Laboratory
    Seagate Technology)

  • J. Åkerman

    (University of Gothenburg
    KTH Royal Institute of Technology
    Tohoku University
    Tohoku University)

Abstract

We demonstrate magnetic droplet soliton pairs in all-perpendicular spin-torque nano-oscillators (STNOs), where one droplet resides in the STNO free layer (FL) and the other in the reference layer (RL). Typically, theoretical, numerical, and experimental droplet studies have focused on the FL, with any additional dynamics in the RL entirely ignored. Here we show that there is not only significant magnetodynamics in the RL, but the RL itself can host a droplet driven by, and coexisting with, the FL droplet. Both single droplets and pairs are observed experimentally as stepwise changes and sharp peaks in the dc and differential resistance, respectively. While the single FL droplet is highly stable, the coexistence state exhibits high-power broadband microwave noise. Furthermore, micromagnetic simulations reveal that the pair dynamics display periodic, quasi-periodic, and chaotic signatures controlled by applied field and current. The strongly interacting and closely spaced droplet pair offers a unique platform for fundamental studies of highly non-linear soliton pair dynamics.

Suggested Citation

  • S. Jiang & S. Chung & M. Ahlberg & A. Frisk & R. Khymyn & Q. Tuan Le & H. Mazraati & A. Houshang & O. Heinonen & J. Åkerman, 2024. "Magnetic droplet soliton pairs," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46404-7
    DOI: 10.1038/s41467-024-46404-7
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    References listed on IDEAS

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    4. Raghav Sharma & Rahul Mishra & Tung Ngo & Yong-Xin Guo & Shunsuke Fukami & Hideo Sato & Hideo Ohno & Hyunsoo Yang, 2021. "Electrically connected spin-torque oscillators array for 2.4 GHz WiFi band transmission and energy harvesting," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
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    7. Martina Ahlberg & Sunjae Chung & Sheng Jiang & Andreas Frisk & Maha Khademi & Roman Khymyn & Ahmad A. Awad & Q. Tuan Le & Hamid Mazraati & Majid Mohseni & Markus Weigand & Iuliia Bykova & Felix Groß &, 2022. "Freezing and thawing magnetic droplet solitons," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
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