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Cited by 194

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Anomalous Magnetic Properties of Nanoparticles Arising from Defect Structures: Topotaxial Oxidation of Fe1–xO|Fe3−δO4 Core|Shell Nanocubes to Single-Phase Particles

Open access
Wetterskog, Erik, Tai, Cheuk-Wai, Grins, Jekabs, Bergström, Lennart, Salazar-Alvarez, German·2013·ACS Nano

Abstract

Here we demonstrate that the anomalous magnetic properties of iron oxide nanoparticles are correlated with defects in their interior. We studied the evolution of microstructure and magnetic properties of biphasic core|shell Fe(1-x)O|Fe(3-δ)O4 nanoparticles synthesized by thermal decomposition during their topotaxial oxidation to single-phase nanoparticles. Geometric phase analysis of high-resolution electron microscopy images reveals a large interfacial strain at the core|shell interface and the development of antiphase boundaries. Dark-field transmission electron microscopy and powder X-ray diffraction concur that, as the oxidation proceeds, the interfacial strain is released as the Fe(1-x)O core is removed but that the antiphase boundaries remain. The antiphase boundaries result in anomalous magnetic behavior, that is, a reduced saturation magnetization and exchange bias effects in single-phase nanoparticles. Our results indicate that internal defects play an important role in dictating the magnetic properties of iron oxide nanoparticles.

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Metadata

Authors
Wetterskog, E., Tai, C.-W., Grins, J., Bergström, L., & Salazar-Alvarez, G.
Venue
ACS Nano
Published
2013-08-05
Volume
7
Issue
8
Pages
7132-7144
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
OpenAlex
W2156244746
Cited by
194
References
3
FWCI
6.36
Type
journal article
Language
en
Open access
hybrid

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