Micromagnetic Simulation of the Shape Effect on the Permeability and Loss Tangent of Fe3O4 Nanoparticles in the Microwave Range

Micromagnetic simulations are applied in order to investigate the effect of shape on the magnetic permeability and loss tangent for Fe3O4 nanoparticles in the frequency range of 0.5 to 20 GHz. Fe3O4 nanoparticles with 6 different shapes and equal volumes are studied in two groups: spherical particles, and prismatic particles with a hexagonal base. Our results show that, generally, elongated particles demonstrate higher microwave magnetic permeability. Moreover, we find that elongation reduces the resonance frequency in prismatic particles, while increases it in spherical ones. These results are important in designing advanced microwave absorbers, as they can be used to predict the effective permeability of a composite medium containing a certain percentage of magnetic nanoparticles.

Automated summary

Micromagnetic simulations were used to study the influence of shape on the magnetic permeability and loss tangent of Fe3O4 nanoparticles in the frequency range of 0.5 to 20 GHz. The study focused on 6 different shapes of Fe3O4 nanoparticles with equal volumes, divided into spherical particles and prismatic particles with a hexagonal base. The results showed that elongated particles generally had higher microwave magnetic permeability. Additionally, elongation decreased the resonance frequency in prismatic particles while increasing it in spherical ones. These findings are crucial for designing advanced microwave absorbers and predicting the effective permeability of composites containing magnetic nanoparticles.