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Dipolar ferromagnetism in ensembles of ellipsoidal nanoparticles

The phase diagram and mean local field theory for ensembles of dipolar interacting ellipsoidal nanoparticles randomly distributed over the sites of a tetragonal lattice are constructed. Dipolar ferromagnetism in the ensembles arises from a competition between the ferro- and antiferromagnetic interactions of the nanoparticle magnetic moments. A critical temperature is defined for these systems with magnitude depending on the shape of the nanoparticles.