---
OA_place: publisher
OA_type: hybrid
PlanS_conform: '1'
_id: '20847'
abstract:
- lang: eng
  text: "We report on an experimental active matter system with motion restricted
    to four cardinal directions. Our particles are magnetite-doped colloidal spheres
    driven by the Quincke electrorotational instability. The absence of a magnetic
    field (|\U0001D469|=0) leads to circular trajectories interspersed with short
    spontaneous runs. Intermediate fields (|\U0001D469|≲20mT) linearize the motion
    along the axis perpendicular to \U0001D469. At high magnetic fields, we observe
    the surprising emergence of a second, distinct linearization along the axis parallel
    to \U0001D469. With numerical simulations, we show that this behavior can be explained
    by anisotropic magnetic susceptibility."
acknowledged_ssus:
- _id: M-Shop
- _id: NanoFab
- _id: ScienComp
- _id: LifeSc
acknowledgement: "This research was funded in whole or in part by the Austrian Science
  Fund (FWF) [Grant DOI: 10.55776/ESP298]. This project has received funding from
  the European Research Council (ERC) under the European Union’s Horizon 2020 research
  and innovation programme (Grant\r\nAgreement No. 949120). This research was supported
  by the Scientific Service Units of The Institute of Science and Technology Austria
  (ISTA) through resources provided by the Miba Machine Shop, Nanofabrication Facility,
  Scientific Computing Facility, and Lab Support Facility. We wish to acknowledge
  the crucial contributions of Alexandre Morin in getting the project off the ground,
  and Jack Merrin for creating the SU-8 deposition protocol used in the construction
  of our\r\ncells. We also wish to thank Kimberley Modic and Hamza Nasir for their
  work on single-particle characterization. "
article_number: '065418'
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Eavan
  full_name: Fitzgerald, Eavan
  id: 2df8ab8f-080d-11ed-979a-bfe651ca3afa
  last_name: Fitzgerald
- first_name: Cécile
  full_name: Clavaud, Cécile
  id: 5f654c5d-04a1-11eb-ab36-ba9ffec58bd8
  last_name: Clavaud
  orcid: 0000-0002-1843-3803
- first_name: Debasish
  full_name: Das, Debasish
  last_name: Das
- first_name: Isaac C
  full_name: Lenton, Isaac C
  id: a550210f-223c-11ec-8182-e2d45e817efb
  last_name: Lenton
  orcid: 0000-0002-5010-6984
- first_name: Scott R
  full_name: Waitukaitis, Scott R
  id: 3A1FFC16-F248-11E8-B48F-1D18A9856A87
  last_name: Waitukaitis
  orcid: 0000-0002-2299-3176
citation:
  ama: 'Fitzgerald E, Clavaud C, Das D, Lenton IC, Waitukaitis SR. Rolling at right
    angles: Magnetic anisotropy enables dual-anisotropic active matter. <i>Physical
    Review E</i>. 2025;112(6). doi:<a href="https://doi.org/10.1103/1ss8-31rb">10.1103/1ss8-31rb</a>'
  apa: 'Fitzgerald, E., Clavaud, C., Das, D., Lenton, I. C., &#38; Waitukaitis, S.
    R. (2025). Rolling at right angles: Magnetic anisotropy enables dual-anisotropic
    active matter. <i>Physical Review E</i>. American Physical Society. <a href="https://doi.org/10.1103/1ss8-31rb">https://doi.org/10.1103/1ss8-31rb</a>'
  chicago: 'Fitzgerald, Eavan, Cécile Clavaud, Debasish Das, Isaac C Lenton, and Scott
    R Waitukaitis. “Rolling at Right Angles: Magnetic Anisotropy Enables Dual-Anisotropic
    Active Matter.” <i>Physical Review E</i>. American Physical Society, 2025. <a
    href="https://doi.org/10.1103/1ss8-31rb">https://doi.org/10.1103/1ss8-31rb</a>.'
  ieee: 'E. Fitzgerald, C. Clavaud, D. Das, I. C. Lenton, and S. R. Waitukaitis, “Rolling
    at right angles: Magnetic anisotropy enables dual-anisotropic active matter,”
    <i>Physical Review E</i>, vol. 112, no. 6. American Physical Society, 2025.'
  ista: 'Fitzgerald E, Clavaud C, Das D, Lenton IC, Waitukaitis SR. 2025. Rolling
    at right angles: Magnetic anisotropy enables dual-anisotropic active matter. Physical
    Review E. 112(6), 065418.'
  mla: 'Fitzgerald, Eavan, et al. “Rolling at Right Angles: Magnetic Anisotropy Enables
    Dual-Anisotropic Active Matter.” <i>Physical Review E</i>, vol. 112, no. 6, 065418,
    American Physical Society, 2025, doi:<a href="https://doi.org/10.1103/1ss8-31rb">10.1103/1ss8-31rb</a>.'
  short: E. Fitzgerald, C. Clavaud, D. Das, I.C. Lenton, S.R. Waitukaitis, Physical
    Review E 112 (2025).
corr_author: '1'
date_created: 2025-12-21T23:01:34Z
date_published: 2025-12-01T00:00:00Z
date_updated: 2025-12-29T11:19:34Z
day: '01'
ddc:
- '530'
department:
- _id: ScWa
doi: 10.1103/1ss8-31rb
ec_funded: 1
external_id:
  arxiv:
  - '2508.05643'
file:
- access_level: open_access
  checksum: d593e933f976c3f3cde37ad66539d57d
  content_type: application/pdf
  creator: dernst
  date_created: 2025-12-29T11:15:42Z
  date_updated: 2025-12-29T11:15:42Z
  file_id: '20862'
  file_name: 2025_PhysReviewE_Fitzgerald.pdf
  file_size: 2131491
  relation: main_file
  success: 1
file_date_updated: 2025-12-29T11:15:42Z
has_accepted_license: '1'
intvolume: '       112'
issue: '6'
language:
- iso: eng
month: '12'
oa: 1
oa_version: Published Version
project:
- _id: bd8eede5-d553-11ed-ba76-eaded0d13485
  grant_number: E 298
  name: 'MixQUIckR: Mixing with QUIncke Rollers'
- _id: 0aa60e99-070f-11eb-9043-a6de6bdc3afa
  call_identifier: H2020
  grant_number: '949120'
  name: 'Tribocharge: a multi-scale approach to an enduring problem in physics'
publication: Physical Review E
publication_identifier:
  eissn:
  - 2470-0053
  issn:
  - 2470-0045
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Rolling at right angles: Magnetic anisotropy enables dual-anisotropic active
  matter'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 112
year: '2025'
...