Mean-field modelling of magnetic nanoparticles: The effect of particle size and shape on the Curie temperature

A Heisenberg mean-field model is used to study the effect of size and shape on the Curie temperature of magnetic nanoparticles. Simple cubic, body-centered cubic, and magnetite nanoparticles are modelled as spheres, cubes, and needlelike particles. The Curie temperatures of particles of different shape, but with the same crystal structure and smallest dimension d are found to differ. The range in the value of the Curie temperature between...