Cr-substituted Fe3O4 nanoparticles : The role of particle size in the formation of FexO sub-domains and the emergence of exchange bias
(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
- Bulbucan, Claudiu LU ; Ternero, Pau LU ; Preger, Calle LU ; Kostanyan, Aram ; Messing, Maria E. LU and Westerström, Rasmus LU
- organization
- publishing date
- 2023-03-15
- 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&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}}, }