Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9834701 | Journal of Magnetism and Magnetic Materials | 2005 | 10 Pages |
Abstract
A simple theory, using the differential operator technique with the approximated Van der Waerden identity, was developed to investigate two-dimensional arrays of magnetic nanodots. The calculations were performed using an Ising model for a hexagonal lattice consisting of metallic nanodots deposited onto non-magnetic insulator substrate. The nanodots are assumed to interact with each other via a tunneling exchange coupling. The nanodot magnetic moment was represented by an effective spin which simulates thermal fluctuations. We found that the superferromagnetic ordering temperature increases with the dot-size, magnetic anisotropy, and dot volume fraction, and is strongly dependent upon the substrate parameters.
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Authors
A.F. Bakuzis, P.C. Morais,