期刊
PHYSICAL REVIEW B
卷 82, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.134433
关键词
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资金
- Xunta de Galicia [INCITE 08PXIB236052PR]
- Spanish Ministry of Education and Science [NAN2004-09203-C04-04, NAN2004-09195-C04-01]
- 2006-IIF Marie Curie Grant [MIF2-CT-2006-021689,]
- Maria Barbeito program
- Isabel Barreto program
We use a Monte Carlo approach to simulate the influence of the dipolar interaction on assemblies of monodisperse superparamagnetic gamma-Fe(2)O(3) nanoparticles. We have identified a critical concentration c*, that marks the transition between two different regimes in the evolution of the blocking temperature (T(B)) with interparticle interactions. At low concentrations (cc*, the dipolar energy enhances the anisotropic energy barrier and T(B) increases with increasing c so that a larger temperature is required to reach the superparamagnetic state. The fitting of our results with classical particle models and experiments supports the existence of two differentiated regimes. Our data could help to understand apparently contradictory results from the literature.
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