Abstract
In this study, we report the size-effects on the magnetic properties of CoFe2O4 hard ferrite single nanoparticles using Monte Carlo simulation within the Ising model. Free boundaries conditions were used to simulate the cubic nanoparticles with different sizes. Saturation and remanent magnetization increased with the increase of the particle size. Rise of the squareness ratio (Mr/Ms) towards high values is observed. Furthermore, the single-domain size limit is shown for the size of 21 nm. Besides, we evaluated the performance of the cubic shaped CoFe2O4 permanent magnet in term of the maximum energy product. A high value of the (BH)max of about 2.83 MG Oe at room temperature for 21 nm was achieved. The obtained results allowed us to determine the theoretical limits of the magnetic properties of the cubic shaped CoFe2O4 nanoparticles and pave the way for the development of CoFe2O4 spinel ferrites for permanent magnet applications.
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