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Manipulation of emergent vortices in swarms of magnetic rollers

Author

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  • Gašper Kokot

    (Argonne National Laboratory)

  • Alexey Snezhko

    (Argonne National Laboratory)

Abstract

Active colloids are an emergent class of out-of-equilibrium materials demonstrating complex collective phases and tunable functionalities. Microscopic particles energized by external fields exhibit a plethora of fascinating collective phenomena, yet mechanisms of control and manipulation of active phases often remains lacking. Here we report the emergence of unconfined macroscopic vortices in a system of ferromagnetic rollers energized by a vertical alternating magnetic field and elucidate the complex nature of a magnetic roller-vortex interactions with inert scatterers. We demonstrate that active self-organized vortices have an ability to spontaneously switch the direction of rotation and move across the surface. We reveal the capability of certain non-active particles to pin the vortex and manipulate its dynamics. Building on our findings, we demonstrate the potential of magnetic roller vortices to effectively capture and transport inert particles at the microscale.

Suggested Citation

  • Gašper Kokot & Alexey Snezhko, 2018. "Manipulation of emergent vortices in swarms of magnetic rollers," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04765-w
    DOI: 10.1038/s41467-018-04765-w
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    Cited by:

    1. Cantisán, Julia & Seoane, Jesús M. & Sanjuán, Miguel A.F., 2023. "Rotating cluster formations emerge in an ensemble of active particles," Chaos, Solitons & Fractals, Elsevier, vol. 172(C).
    2. Michael Riedl & Isabelle Mayer & Jack Merrin & Michael Sixt & Björn Hof, 2023. "Synchronization in collectively moving inanimate and living active matter," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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