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Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators

Author

Listed:
  • Sunjae Chung

    (University of Gothenburg
    Materials and Nano Physics, School of ICT, KTH-Royal Institute of Technology)

  • Anders Eklund

    (Integrated Devices and Circuits, School of ICT, KTH-Royal Institute of Technology)

  • Ezio Iacocca

    (University of Gothenburg
    University of Colorado, Boulder
    Chalmers University of Technology)

  • Seyed Majid Mohseni

    (Shahid Beheshti University)

  • Sohrab R. Sani

    (Materials and Nano Physics, School of ICT, KTH-Royal Institute of Technology)

  • Lake Bookman

    (Yale University, New Haven)

  • Mark A. Hoefer

    (Shahid Beheshti University)

  • Randy K. Dumas

    (University of Gothenburg)

  • Johan Åkerman

    (University of Gothenburg
    Materials and Nano Physics, School of ICT, KTH-Royal Institute of Technology)

Abstract

Static and dynamic magnetic solitons play a critical role in applied nanomagnetism. Magnetic droplets, a type of non-topological dissipative soliton, can be nucleated and sustained in nanocontact spin-torque oscillators with perpendicular magnetic anisotropy free layers. Here, we perform a detailed experimental determination of the full droplet nucleation boundary in the current–field plane for a wide range of nanocontact sizes and demonstrate its excellent agreement with an analytical expression originating from a stability analysis. Our results reconcile recent contradicting reports of the field dependence of the droplet nucleation. Furthermore, our analytical model both highlights the relation between the fixed layer material and the droplet nucleation current magnitude, and provides an accurate method to experimentally determine the spin transfer torque asymmetry of each device.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11209
    DOI: 10.1038/ncomms11209
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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.
    2. 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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