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Peer-reviewedCC BY-NC-ND 4.0Physical Review Letters

Driven Shear Flow in Biological Magnetoactive Fluids

  • M. Marmol
  • C. Cottin-Bizonne
  • A. Cēbers
  • D. Faivre
  • C. Ybert
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Abstract

Active fluids made of powered suspended entities spontaneously give rise to patterns and flows. Yet, how the swimmers activity can be harnessed by external cues into coherent macroscopic flows remains a question of biological and applied relevance. Here, we use magnetotactic bacteria, which respond both to chemical and magnetic signals, to control the onset of global scale shear flows. Shaping positional and orientational orders with external fields allows the force dipoles of each swimmer to combine into a finite active stress. Incorporated in a magnetoactive model, this driving contribution quantitatively captures the observed flows in steady state, while the time-dependent response to rotating fields unveils additional complexity.

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Cite

BibTeXRIS
BibTeX
@article{marmol2026driven,
  title = {{Driven Shear Flow in Biological Magnetoactive Fluids}},
  author = {M. Marmol and C. Cottin-Bizonne and A. Cēbers and D. Faivre and C. Ybert},
  journal = {Physical Review Letters},
  year = {2026},
  month = oct,
  doi = {10.1103/qrgn-m91t},
  eprint = {2507.13851},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05719877v1},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - JOUR
TI  - Driven Shear Flow in Biological Magnetoactive Fluids
AU  - M. Marmol
AU  - C. Cottin-Bizonne
AU  - A. Cēbers
AU  - D. Faivre
AU  - C. Ybert
PY  - 2026
DA  - 2026/10/07
JO  - Physical Review Letters
DO  - 10.1103/qrgn-m91t
UR  - https://hal.science/hal-05719877v1
AB  - Active fluids made of powered suspended entities spontaneously give rise to patterns and flows. Yet, how the swimmers activity can be harnessed by external cues into coherent macroscopic flows remains a question of biological and applied relevance. Here, we use magnetotactic bacteria, which respond both to chemical and magnetic signals, to control the onset of global scale shear flows. Shaping positional and orientational orders with external fields allows the force dipoles of each swimmer to combine into a finite active stress. Incorporated in a magnetoactive model, this driving contribution quantitatively captures the observed flows in steady state, while the time-dependent response to rotating fields unveils additional complexity.
SN  - 0031-9007
SN  - 1079-7114
ER  -