Unraveling the Infra-Red Plasmons of Ferromagnetic Cobalt Nanorods with EELS
7 affiliations
- 1Université Paris Cité, CNRS, ITODYS
- 2Laboratoire de Physique des Solides
- 3CNRS
- 4CINBIO
- 5Universidade de Vigo
- 6Departamento de Física Aplicada
- 7Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques
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.
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BibTeX
@misc{chaabani2026unraveling,
title = {{Unraveling the Infra-Red Plasmons of Ferromagnetic Cobalt Nanorods with EELS}},
author = {Wajdi Chaâbani and Xiaoyan Li and Charlène Brissaud and Maria Merajoddin and Lucas V. Besteiro and Jaysen Nelayah and Mathieu Kociak and Nordin Felidj and Jean-Yves Piquemal and Miguel Comesaña-Hermo},
howpublished = {ChemRxiv},
year = {2026},
month = sep,
doi = {10.26434/chemrxiv.15008500/v1},
url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008500/v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - Unraveling the Infra-Red Plasmons of Ferromagnetic Cobalt Nanorods with EELS
AU - Wajdi Chaâbani
AU - Xiaoyan Li
AU - Charlène Brissaud
AU - Maria Merajoddin
AU - Lucas V. Besteiro
AU - Jaysen Nelayah
AU - Mathieu Kociak
AU - Nordin Felidj
AU - Jean-Yves Piquemal
AU - Miguel Comesaña-Hermo
PY - 2026
DA - 2026/09/08
PB - ChemRxiv
DO - 10.26434/chemrxiv.15008500/v1
UR - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008500/v1
AB - 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.
ER -