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Microstructural and Magnetic Investigations of Wüstite-Spinel Core-Shell Cubic-Shaped Nanoparticles
Abstract
Most studies on the synthesis of nanoparticles are currently focused on the controlled synthesis of new morphologies, including core-shell structures, which are expected to exhibit new magnetic properties for uses in spintronics and recording media applications. In this study, the structure, morphology, and composition of cubic-shaped nanoparticles are carefully investigated and compared to those of spherically shaped nanoparticles through the use of a combination of techniques: X-ray diffraction (XRD) and transmission electronic microscopy (TEM) combined with more sensitive techniques such as scanning transmission electron microscopy-high-angle annular dark field (STEM-HAADF) imaging, electron tomography, and holography. While spherically shaped nanoparticles (NPs) crystallize with the spinel structure, cubic-shaped NPs can be described as a cubic core of wüstite surrounded by a spinel shell. Stresses are observed at the core-shell interface and within the spinel shell due to the epitaxial growth and oxidation mechanisms of the wüstite phase. Furthermore, magnetic measurements displayed an exchange bias coupling between the antiferromagnetic (AFM) core and the ferrimagnetic (FIM) shell structure of cubic-shaped nanoparticles. It is shown that the magnetic properties are influenced by stresses generated by the oxidation of wüstite and, also exhibit variations depending upon the evolution of this core-shell structure as a function of the oxidation time.
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Ultra-large-scale syntheses of monodisperse nanocrystals
Park, J., An, K., Hwang, Y., Park, J.-G., Noh, H.-J., Kim, J.-Y., Park, J.-H., Hwang, N.-M., & Hyeon, T. (2004) · Nature Materials · doi:10.1038/nmat1251 · Cited by 4,076
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Périgo, E. A., Hemery, G., Sandre, O., Ortega, D., Garaio, E., Plazaola, F., & Teran, F. J. (2015) · Applied Physics Reviews · doi:10.1063/1.4935688 · Cited by 836
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Magnetic Iron Oxide Nanoparticle (IONP) Synthesis to Applications: Present and Future
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Synthesis of phase-pure and monodisperse iron oxide nanoparticles by thermal decomposition
Hufschmid, R., Arami, H., Ferguson, R. M., Gonzales, M., Teeman, E., Brush, L. N., Browning, N. D., & Krishnan, K. M. (2015) · Nanoscale · doi:10.1039/c5nr01651g · Cited by 341
Song, Q., & Zhang, Z. J. (2012) · Journal of the American Chemical Society · doi:10.1021/ja302856z · Cited by 301
Metadata
- Authors
- Pichon, B. P., Gerber, O., Lefevre, C., Florea, I., Fleutot, S., Baaziz, W., Pauly, M., Ohlmann, M., Ulhaq, C., Ersen, O., Pierron-Bohnes, V., Panissod, P., Drillon, M., & Begin-Colin, S.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-05-05
- Volume
- 23
- Issue
- 11
- Pages
- 2886-2900
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2326871751
- Cited by
- 166
- References
- 1
- FWCI
- 6.04
- Type
- journal article
- Language
- en
- Open access
- closed
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- Pichon, B. P., Gerber, O., Lefevre, C., Florea, I., Fleutot, S., Baaziz, W., Pauly, M., Ohlmann, M., Ulhaq, C., Ersen, O., Pierron-Bohnes, V., Panissod, P., Drillon, M., & Begin-Colin, S. (2011). Microstructural and Magnetic Investigations of Wüstite-Spinel Core-Shell Cubic-Shaped Nanoparticles. Chemistry of Materials. https://doi.org/10.1021/cm2003319
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