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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Lappas, A. Trohidou, K. N. Douvalis, A. P. Lascialfari, A. Manna, L. Vasilakaki, M. Kostopoulou, A. Brintakis, K. |
| Copyright Year | 2014 |
| Abstract | Controlled assembly of single-crystal, colloidal maghemite nanoparticles is facilitated via a high-temperature polyol-based pathway. Structural characterization shows that size-tunable nanoclusters of 50 and 86 nm diameters (D), with high dispersibility in aqueous media, are composed of ∼13 nm (d) crystallographically oriented nanoparticles. The interaction effects are examined against the increasing volume fraction, φ, of the inorganic magnetic phase that goes from individual colloidal nanoparticles (φ = 0.47) to clusters (φ = 0.72). The frozen-liquid dispersions of the latter exhibit weak ferrimagnetic behaviour at 300 K. Comparative Mössbauer spectroscopic studies imply that intra-cluster interactions come into play. New insight emerges from the clusters' temperature-dependent ac susceptibility that displays two maxima in χ′′(T), with strong frequency dispersion. Scaling-law analysis together with the observed memory effects suggests that a superspin-glass state settles-in at TB ∼ 160–200 K, while at lower-temperatures, surface spin-glass freezing is established at Tf ∼ 40–70 K. In such nanoparticle-assembled systems, with increased φ, Monte Carlo simulations corroborate the role of the inter-particle dipolar interactions and that of the constituent nanoparticles' surface spin disorder in the emerging spin-glass dynamics. |
| Starting Page | 3764 |
| Ending Page | 3776 |
| Page Count | 13 |
| File Format | HTM / HTML PDF |
| ISSN | 20403364 |
| Volume Number | 6 |
| Issue Number | 7 |
| Journal | Nanoscale |
| DOI | 10.1039/c3nr06103e |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Monte Carlo method Monte Carlo Ferrimagnetism Dispersion relation Memory Maghemite |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology |
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