{
  "abstract": "Collective synchronization is a common response of interacting magnetic particles subjected to rotating external fields. Here we demonstrate a distinct nonequilibrium state in a two-dimensional cluster of magnetic colloidal particles in which the ordered crystalline core rotates, on average, opposite to the direction of the applied rotating magnetic field, while the defect-rich outer region continues to rotate with the drive. We term this state anti-synchronized collective rotation. By combining structural, spectral, bond-resolved, and layer-resolved torque analyses, we show that anti-synchronization is associated with a broader defect-rich interface, enhanced and dynamically heterogeneous bond deformation, and a reorganization of torque transmission between the surface and the crystalline interior. In the synchronized state, steric torques compensate the opposing dipolar contribution in the outer core, maintaining a positive net interaction torque. In the anti-synchronized state this compensation becomes insufficient, producing a negative net torque in theouter core and enabling core-surface rotational decoupling. Increasing the driving frequency restores coherent rotation through a transition characterized by competing positive- and negative-angular-velocity populations and hysteresis, consistent with a discontinuous, first-order-like dynamical transition. These results demonstrate how deformation and spatial redistribution of interaction torques can generate counter-rotating collective states in driven colloidal matter.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.23784",
  "author_total": 2,
  "authors": [
    {
      "name": "Adithya Bharath"
    },
    {
      "name": "A. V. Anil Kumar"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e9vzfe8w4z8ng.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.23784",
  "fulltext_url": null,
  "id": "e9vzfe8w4z8ng",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.23784",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.soft"
    ],
    [
      "arxiv",
      "cond-mat.stat-mech"
    ],
    [
      "openalex",
      "2204|Characterization and Applications of Magnetic Nanoparticles"
    ]
  ],
  "openalex": "W7222918990",
  "pdf_url": "https://arxiv.org/pdf/2610.23784",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e9vzfe8w4z8ng.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2610.23784",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.23784"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.soft",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Anti-synchronized collective rotation in magnetic colloidal particles under rotating magnetic fields",
  "title_text": "Anti-synchronized collective rotation in magnetic colloidal particles under rotating magnetic fields",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/e9vzfe8w4z8ng",
  "venue": "arXiv",
  "versions": []
}