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Cr-substituted Fe3O4 nanoparticles : The role of particle size in the formation of FexO sub-domains and the emergence of exchange bias

Bulbucan, Claudiu LU ; Ternero, Pau LU ; Preger, Calle LU orcid ; Kostanyan, Aram ; Messing, Maria E. LU and Westerström, Rasmus LU (2023) In Journal of Magnetism and Magnetic Materials 570.
Abstract

Here we study the influence of particle size on the formation of antiferromagnetic FexO subdomains and the emergence of exchange bias in novel ferrimagnetic Cr-substituted Fe3O4 nanoparticles generated using an aerosol technique based on spark ablation. Cooling in an applied magnetic field across the Néel temperature of the FexO subdomains results in significant shifts in the hysteresis loops, which decrease in magnitude with the particle diameter for the two large systems (D≈20nm&D≈40nm), whereas only minor exchange fields are observed for the smallest system (D≈10nm). The reduced exchange bias is attributed to the metastable FexO's lower volume fraction and size due to a... (More)

Here we study the influence of particle size on the formation of antiferromagnetic FexO subdomains and the emergence of exchange bias in novel ferrimagnetic Cr-substituted Fe3O4 nanoparticles generated using an aerosol technique based on spark ablation. Cooling in an applied magnetic field across the Néel temperature of the FexO subdomains results in significant shifts in the hysteresis loops, which decrease in magnitude with the particle diameter for the two large systems (D≈20nm&D≈40nm), whereas only minor exchange fields are observed for the smallest system (D≈10nm). The reduced exchange bias is attributed to the metastable FexO's lower volume fraction and size due to a facile transformation into the thermodynamically stable (Fe,Cr)3O4 phase with decreasing particle diameter.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bimagnetic nanoparticles, Exchange bias
in
Journal of Magnetism and Magnetic Materials
volume
570
article number
170359
publisher
Elsevier
external identifiers
  • scopus:85147603485
ISSN
0304-8853
DOI
10.1016/j.jmmm.2023.170359
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2023
id
baf1fda5-2dea-4a43-a1d4-c46d7f5a1351
date added to LUP
2023-06-29 15:33:54
date last changed
2023-11-08 07:17:24
@article{baf1fda5-2dea-4a43-a1d4-c46d7f5a1351,
  abstract     = {{<p>Here we study the influence of particle size on the formation of antiferromagnetic Fe<sub>x</sub>O subdomains and the emergence of exchange bias in novel ferrimagnetic Cr-substituted Fe<sub>3</sub>O<sub>4</sub> nanoparticles generated using an aerosol technique based on spark ablation. Cooling in an applied magnetic field across the Néel temperature of the Fe<sub>x</sub>O subdomains results in significant shifts in the hysteresis loops, which decrease in magnitude with the particle diameter for the two large systems (D≈20nm&amp;D≈40nm), whereas only minor exchange fields are observed for the smallest system (D≈10nm). The reduced exchange bias is attributed to the metastable Fe<sub>x</sub>O's lower volume fraction and size due to a facile transformation into the thermodynamically stable (Fe,Cr)<sub>3</sub>O<sub>4</sub> phase with decreasing particle diameter.</p>}},
  author       = {{Bulbucan, Claudiu and Ternero, Pau and Preger, Calle and Kostanyan, Aram and Messing, Maria E. and Westerström, Rasmus}},
  issn         = {{0304-8853}},
  keywords     = {{Bimagnetic nanoparticles; Exchange bias}},
  language     = {{eng}},
  month        = {{03}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Magnetism and Magnetic Materials}},
  title        = {{Cr-substituted Fe<sub>3</sub>O<sub>4</sub> nanoparticles : The role of particle size in the formation of Fe<sub>x</sub>O sub-domains and the emergence of exchange bias}},
  url          = {{http://dx.doi.org/10.1016/j.jmmm.2023.170359}},
  doi          = {{10.1016/j.jmmm.2023.170359}},
  volume       = {{570}},
  year         = {{2023}},
}