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Freezing and thawing magnetic droplet solitons

Author

Listed:
  • Martina Ahlberg

    (University of Gothenburg)

  • Sunjae Chung

    (University of Gothenburg
    Korea National University of Education)

  • Sheng Jiang

    (University of Gothenburg
    Northwestern Polytechnical University
    KTH Royal Institute of Technology)

  • Andreas Frisk

    (University of Gothenburg)

  • Maha Khademi

    (Shahid Beheshti University, Evin)

  • Roman Khymyn

    (University of Gothenburg)

  • Ahmad A. Awad

    (University of Gothenburg)

  • Q. Tuan Le

    (University of Gothenburg
    KTH Royal Institute of Technology)

  • Hamid Mazraati

    (KTH Royal Institute of Technology
    NanOsc AB)

  • Majid Mohseni

    (KTH Royal Institute of Technology
    Shahid Beheshti University, Evin)

  • Markus Weigand

    (Max Planck Institute for Intelligent Systems)

  • Iuliia Bykova

    (Max Planck Institute for Intelligent Systems)

  • Felix Groß

    (Max Planck Institute for Intelligent Systems)

  • Eberhard Goering

    (Max Planck Institute for Intelligent Systems)

  • Gisela Schütz

    (Max Planck Institute for Intelligent Systems)

  • Joachim Gräfe

    (Max Planck Institute for Intelligent Systems)

  • Johan Åkerman

    (University of Gothenburg
    KTH Royal Institute of Technology)

Abstract

Magnetic droplets are non-topological magnetodynamical solitons displaying a wide range of complex dynamic phenomena with potential for microwave signal generation. Bubbles, on the other hand, are internally static cylindrical magnetic domains, stabilized by external fields and magnetostatic interactions. In its original theory, the droplet was described as an imminently collapsing bubble stabilized by spin transfer torque and, in its zero-frequency limit, as equivalent to a bubble. Without nanoscale lateral confinement, pinning, or an external applied field, such a nanobubble is unstable, and should collapse. Here, we show that we can freeze dynamic droplets into static nanobubbles by decreasing the magnetic field. While the bubble has virtually the same resistance as the droplet, all signs of low-frequency microwave noise disappear. The transition is fully reversible and the bubble can be thawed back into a droplet if the magnetic field is increased under current. Whereas the droplet collapses without a sustaining current, the bubble is highly stable and remains intact for days without external drive. Electrical measurements are complemented by direct observation using scanning transmission x-ray microscopy, which corroborates the analysis and confirms that the bubble is stabilized by pinning.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30055-7
    DOI: 10.1038/s41467-022-30055-7
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    References listed on IDEAS

    as
    1. Sunjae Chung & Anders Eklund & Ezio Iacocca & Seyed Majid Mohseni & Sohrab R. Sani & Lake Bookman & Mark A. Hoefer & Randy K. Dumas & Johan Åkerman, 2016. "Erratum: Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators," Nature Communications, Nature, vol. 7(1), pages 1-1, September.
    2. Miguel Romera & Philippe Talatchian & Sumito Tsunegi & Flavio Abreu Araujo & Vincent Cros & Paolo Bortolotti & Juan Trastoy & Kay Yakushiji & Akio Fukushima & Hitoshi Kubota & Shinji Yuasa & Maxence E, 2018. "Vowel recognition with four coupled spin-torque nano-oscillators," Nature, Nature, vol. 563(7730), pages 230-234, November.
    3. Sunjae Chung & Anders Eklund & Ezio Iacocca & Seyed Majid Mohseni & Sohrab R. Sani & Lake Bookman & Mark A. Hoefer & Randy K. Dumas & Johan Åkerman, 2016. "Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators," Nature Communications, Nature, vol. 7(1), pages 1-8, September.
    4. Jacob Torrejon & Mathieu Riou & Flavio Abreu Araujo & Sumito Tsunegi & Guru Khalsa & Damien Querlioz & Paolo Bortolotti & Vincent Cros & Kay Yakushiji & Akio Fukushima & Hitoshi Kubota & Shinji Yuasa , 2017. "Neuromorphic computing with nanoscale spintronic oscillators," Nature, Nature, vol. 547(7664), pages 428-431, July.
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    Cited by:

    1. 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.

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