Abstract
Monte Carlo simulations are carried out to evaluate the effective magnetic moment μeff of clusters containing 100 magnetic nanocrystals (MNCs) in a low magnetic field. The true value of the initial magnetic susceptibility, i.e. χ0 = δM/δH at zero field, can be easily assessed from μeff. Results show that dipolar interactions contribute to reduce the effective magnetic moment. Below a threshold value near the low-field region, clusters of MNCs with smaller diameters possess a larger effective magnetic moment per unit volume compared to clusters with larger MNCs. This is of particular interest for bio-sensing systems relying on the magnetic response of magnetic multi-core nanoparticles in the low-field region.
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