Two-dimensional arrangements of magnetic nanoparticles

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Abstract
Arrangements of magnetic nanoparticles in a plane interacting through hard core repulsion and magnetic dipole-dipole interaction are deduced from Monte Carlo relaxations. At low density, magnetic particles are arranged in sinuous lines and rings, while at higher densities lines of magnetic moments aggregate in spirals and vortices. An in-plane magnetic field tends to make lines parallel to the field and to break rings, while a perpendicular-to-the-plane field tends to arrange the particles in a glassy state.