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Dipolar energy states in clusters of perpendicular magnetic nanoislands
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View: Figures


Image of FIG. 1.
FIG. 1.

Geometries of the different clusters of perpendicular islands on a triangular lattice with the number of islands, . One of the degenerate ground state configurations is shown for each cluster together with its degree of degeneracy, the total number of possible states , and the number of energy levels obtained from the energy calculation.6 For the different magnetic states, the islands with moments pointing up (down) are white (black), and the favorable (unfavorable) interactions are given by the dashed (continuous) line.

Image of FIG. 2.
FIG. 2.

(a) Scanning electron microscope image of the seven-island cluster with diameter, and lattice parameter . (b) Schematic of the demagnetization setup with the sample rotating about an in-plane axis. XMCD images of the seven-island cluster following demagnetization with , and (c) and (d) . The uniform contrast associated with each island indicates that they are monodomain with the magnetic moments pointing perpendicular to the sample plane, either up (white) or down (black). The ground states are highlighted with a circular frame.

Image of FIG. 3.
FIG. 3.

Observed frequency of states for the different island clusters, including the random distribution expected for zero interisland coupling (rhombuses) and the experimentally measured values for low coupling (, white bars) and high coupling (, gray bars). For each level, one of the possible magnetic configurations is shown and levels which are close in energy6 are grouped in brackets. In the inset, the values of the demagnetization effectiveness parameter, , for all clusters, divided into clusters with high coupling (squares) and low coupling (circles), are given.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dipolar energy states in clusters of perpendicular magnetic nanoislands