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Large exchange bias in Cr substituted Fe3O4nanoparticles with FeO subdomains

Bulbucan, Claudiu LU ; Preger, Calle LU orcid ; Kostanyan, Aram ; Jensen, Kirsten M.Ø. ; Kokkonen, Esko LU orcid ; Piamonteze, Cinthia ; Messing, Maria E. LU and Westerström, Rasmus LU (2021) In Nanoscale 13(37). p.15844-15852
Abstract

Tuning the anisotropy through exchange bias in bimagnetic nanoparticles is an active research strategy for enhancing and tailoring the magnetic properties for a wide range of applications. Here we present a structural and magnetic characterization of unique FeCr-oxide nanoparticles generated from seed material with a Fe : Cr ratio of 4.71 : 1 using a physical aerosol method based on spark ablation. The nanoparticles have a novel bimagnetic structure composed of a 40 nm ferrimagnetic Cr-substituted Fe3O4 structure with 4 nm antiferromagnetic FexO subdomains. Cooling in an applied magnetic field across the Néel temperature of the FexO subdomains results in a significant shift in the hysteresis, demonstrating the presence of a large... (More)

Tuning the anisotropy through exchange bias in bimagnetic nanoparticles is an active research strategy for enhancing and tailoring the magnetic properties for a wide range of applications. Here we present a structural and magnetic characterization of unique FeCr-oxide nanoparticles generated from seed material with a Fe : Cr ratio of 4.71 : 1 using a physical aerosol method based on spark ablation. The nanoparticles have a novel bimagnetic structure composed of a 40 nm ferrimagnetic Cr-substituted Fe3O4 structure with 4 nm antiferromagnetic FexO subdomains. Cooling in an applied magnetic field across the Néel temperature of the FexO subdomains results in a significant shift in the hysteresis, demonstrating the presence of a large exchange bias. The observed shift of μ0HE = 460 mT is among the largest values reported for FexO-Fe3O4-based nanoparticles and is attributed to the large antiferromagnetic-ferrimagnetic interface area provided by the subdomains.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale
volume
13
issue
37
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:34518859
  • scopus:85116431557
ISSN
2040-3364
DOI
10.1039/d1nr04614d
project
New Smart Nanoparticle Materials: Development & Advanced Characterization
language
English
LU publication?
yes
additional info
Publisher Copyright: © The Royal Society of Chemistry.
id
44568fad-3893-4bef-990a-ff25788c37b8
date added to LUP
2021-10-20 15:26:06
date last changed
2025-01-13 15:37:09
@article{44568fad-3893-4bef-990a-ff25788c37b8,
  abstract     = {{<p>Tuning the anisotropy through exchange bias in bimagnetic nanoparticles is an active research strategy for enhancing and tailoring the magnetic properties for a wide range of applications. Here we present a structural and magnetic characterization of unique FeCr-oxide nanoparticles generated from seed material with a Fe : Cr ratio of 4.71 : 1 using a physical aerosol method based on spark ablation. The nanoparticles have a novel bimagnetic structure composed of a 40 nm ferrimagnetic Cr-substituted Fe3O4 structure with 4 nm antiferromagnetic FexO subdomains. Cooling in an applied magnetic field across the Néel temperature of the FexO subdomains results in a significant shift in the hysteresis, demonstrating the presence of a large exchange bias. The observed shift of μ0HE = 460 mT is among the largest values reported for FexO-Fe3O4-based nanoparticles and is attributed to the large antiferromagnetic-ferrimagnetic interface area provided by the subdomains. </p>}},
  author       = {{Bulbucan, Claudiu and Preger, Calle and Kostanyan, Aram and Jensen, Kirsten M.Ø. and Kokkonen, Esko and Piamonteze, Cinthia and Messing, Maria E. and Westerström, Rasmus}},
  issn         = {{2040-3364}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{37}},
  pages        = {{15844--15852}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Nanoscale}},
  title        = {{Large exchange bias in Cr substituted Fe<sub>3</sub>O<sub>4</sub>nanoparticles with FeO subdomains}},
  url          = {{http://dx.doi.org/10.1039/d1nr04614d}},
  doi          = {{10.1039/d1nr04614d}},
  volume       = {{13}},
  year         = {{2021}},
}