Abstract
We have studied the effect of the shape anisotropy in a system that consists of a chain of N identical spherical particles each of magnetic dipole moment μ and that has an easy axis. By considering two particle interactions (Dimer Model) we have investigated two different distinct cases depending on the direction of the applied field H and the orientation (ξ) of the easy axis relative to H. We found that for the randomly oriented easy axis (ξ) and for H parallel or perpendicular to the chain the anisotropy has no effect on the ferromagnetic state. For fixed orientation (ξ) an interplay between ferromagnetic-like and anti-ferromagnetic-like behavior exists. The existence of each behavior is strongly dependent on the anisotropy K and the direction of H relative to the chain.
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