Freezing and thawing magnetic droplet solitons

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, Eberhard Goering, Gisela Schütz, Joachim Gräfe and Johan Åkerman ()
Additional contact information
Martina Ahlberg: University of Gothenburg
Sunjae Chung: University of Gothenburg
Sheng Jiang: University of Gothenburg
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
Hamid Mazraati: KTH Royal Institute of Technology
Majid Mohseni: KTH Royal Institute of Technology
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

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-30055-7

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