Monte Carlo study of the magnetic behavior of self-assembled nanoparticles

The blocking behavior of quasi-two-dimensional hexagonal arrays of magnetic nanoparticles are studied by Monte Carlo simulations. Structural deviations from the perfect arrangement are considered (voids, incomplete coverage). We show that interparticle dipolar interactions are responsible for an increase of the blocking temperature with the coverage of the film and a decrease of the blocking temperature with the cube of the interparticle distance. Our results compare satisfactorily with recent experiments.