{
  "abstract": "Localized surface plasmon resonances (LSPRs) in cobalt nanoparticles could offer a cost-effective alternative to noble metals for plasmonic applications, while leveraging their inherent magnetic and catalytic features. Yet the ferromagnetic nature of these objects and their extremely fast oxidation prevent the formation of stable colloidal dispersions, complicating conventional optical characterization in solution or thin films. To address this challenge, we employ electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope 2 (STEM) to directly probe the plasmonic response of individual ferromagnetic cobalt nanorods. Our experimental findings, supported by numerical simulations, reveal anisotropy-driven optical modes in the infrared region, attributed to dipolar and quadrupolar resonances. This work not only demonstrates the plasmonic potential of cobalt nanostructures but also establishes EELS-STEM as a powerful tool for investigating plasmonic phenomena in magnetically active nanomaterials.",
  "abstract_shown": true,
  "affiliations": [
    "Université Paris Cité, CNRS, ITODYS",
    "Laboratoire de Physique des Solides",
    "CNRS",
    "CINBIO",
    "Universidade de Vigo",
    "Departamento de Física Aplicada",
    "Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 10,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Wajdi Chaâbani"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Xiaoyan Li"
    },
    {
      "affs": [
        0
      ],
      "name": "Charlène Brissaud"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Maria Merajoddin"
    },
    {
      "affs": [
        3,
        4,
        5
      ],
      "name": "Lucas V. Besteiro"
    },
    {
      "affs": [
        6
      ],
      "name": "Jaysen Nelayah"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Mathieu Kociak"
    },
    {
      "affs": [
        0
      ],
      "name": "Nordin Felidj"
    },
    {
      "affs": [
        0
      ],
      "name": "Jean-Yves Piquemal"
    },
    {
      "affs": [
        0
      ],
      "name": "Miguel Comesaña-Hermo",
      "orcid": "0000-0001-8471-5510"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5j0zw16z4akhr.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15008500/v1",
  "fulltext_url": null,
  "id": "5j0zw16z4akhr",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008500/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2204|Plasmonic and Surface Plasmon Research"
    ]
  ],
  "openalex": "W7211972230",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15008500/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/5j0zw16z4akhr.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:17Z",
      "native_id": "10.26434/chemrxiv.15008500",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008500/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "source:chemrxiv",
      "subfield": "general"
    }
  ],
  "title": "Unraveling the Infra-Red Plasmons of Ferromagnetic Cobalt Nanorods with EELS",
  "title_text": "Unraveling the Infra-Red Plasmons of Ferromagnetic Cobalt Nanorods with EELS",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:17Z",
  "url": "https://research.draconitic.com/paper/5j0zw16z4akhr",
  "venue": "ChemRxiv",
  "versions": []
}