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Low Temperature Surface Spin-Glass Transition inγ-Fe2O3Nanoparticles
Abstract
$\ensuremath{\gamma}\ensuremath{-}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ magnetic nanoparticles, with a very high surface to volume ratio, exhibit both strong exchange anisotropy and magnetic training effect. At the same time high field irreversibility in $M\left(H\right)$ curves and zero field cooled--field cooled (ZFC-FC) processes has also been detected. A low temperature spin-glass-like transition is evidenced at ${T}_{F}\ensuremath{\approx}42\mathrm{K}$ with strong irreversibility even at $H\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}55\mathrm{kOe}$. ${T}_{F}\left(H\right)$ evolves following the well known de Almeida--Thouless line $\ensuremath{\delta}{T}_{F}\ensuremath{\propto}{H}^{2/3}$. The thermal dependence of the exchange anisotropy field ${H}_{E}$ is described by the random-field model of exchange anisotropy. In the framework of this theory, a surface spin-glass layer about 0.6 nm thick is determined.
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Cited by
Exchange bias in nanostructures
Nogués, J., Sort, J., Langlais, V., Skumryev, V., Suriñach, S., Muñoz, J. S., & Baró, M. D. (2005) · Physics Reports · doi:10.1016/j.physrep.2005.08.004 · Cited by 1,925
Microemulsion-assisted synthesis of tunable superparamagnetic composites
Tartaj, P., & Serna, C. J. (2002) · Chemistry of Materials · doi:10.1021/cm021214d · Cited by 110
Metadata
- Authors
- Martínez, B., Obradors, X., Balcells, L., Rouanet, A., & Monty, C.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 1998-01-05
- Volume
- 80
- Issue
- 1
- Pages
- 181-184
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W139500340
- Cited by
- 792
- References
- 0
- FWCI
- 17.26
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Low Temperature Surface Spin-Glass Transition inγ-Fe2O3Nanoparticles. https://app.cochat.ai/papers/10.1103/physrevlett.80.181
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- Martínez, B., Obradors, X., Balcells, L., Rouanet, A., & Monty, C. (1998). Low Temperature Surface Spin-Glass Transition inγ-Fe2O3Nanoparticles. Physical Review Letters. https://doi.org/10.1103/physrevlett.80.181
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