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Surface and Internal Spin Canting in γ-Fe2O3 Nanoparticles
Abstract
Structural and magnetic properties of γ-Fe 2 O 3 have been studied in isometric nanoparticles ranging from 3 to 14 nm with a narrow particle size distribution. Cation vacancy order is observed for particles larger than 5 nm in diameter giving rise to a cubic superstructure, while for the smallest particles these vacancies are disordered. All magnetic properties measured showed a strong dependence on the average crystallite size. For the ordered samples, saturation magnetization was found to decrease linearly with decreasing crystallite size due to a surface spin canting effect. However, a stronger decrease was observed in the disordered samples, suggesting that also an internal spin canting (cation vacancy order−disorder) has to be taken into account to explain the magnetic properties of nanoparticles. The room-temperature coercive field decreases with decreasing crystallite size; however at low temperatures, the coercivity increases as the size decreases, reaching values larger than 3000 Oe. A model to explain the magnetic properties of these particles considering both surface and order−disorder effects is proposed.
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Metadata
- Authors
- Morales, M. P., Veintemillas-Verdaguer, S., Montero, M. I., Serna, C. J., Roig, A., Casas, L., Martínez, B., & Sandiumenge, F.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 1999-10-27
- Volume
- 11
- Issue
- 11
- Pages
- 3058-3064
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2047660179
- Cited by
- 639
- References
- 0
- FWCI
- 5.15
- Type
- journal article
- Language
- en
- Open access
- closed
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