Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-11-11
Phys. Rev. B 82, 134433 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 7 figures
Scientific paper
10.1103/PhysRevB.82.134433
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 (c < c*) magnetic particles behave as an ideal non-interacting system with a constant $T_{B}$. At concentrations c > c* 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.
Baldomir Daniel
Hoppe C. E.
Pereiro Manuel
Rivadulla F.
Rivas J.
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