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(a) A vortex flux closure consisting of four domains. (b) The hexadomain vortex.
The hexadomain vortex shown in several rotated views.
Normalized free energy vs aspect ratio for cuboidal nanodots. Dashed lines indicate the hexadomain vortex solutions. Solid lines mark the planar tetradomain and in another branch, the rod-type tetradomain.
Phase-field solution showing (a) a stable hexadomain vortex of aspect ratio 1.5 and (b) an imperfect, but stable hexadomain vortex of unity aspect ratio. Arrows show the local polarization direction.
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