  We study the spontaneous spin textures induced by magnetic dipole-dipole
interaction in ferromagnetic spinor condensates under various trap geometries.
At the mean-field level, we show the system is dual to a Dirac string gas with
a negative string tension in which the ground state spin texture can be easily
determined. We find that three-dimensional condensates prefer a meron-like
vortex texture, quasi one-dimensional condensates prefer the axially polarized
flare texture, while condensates in quasi two dimensions exhibit either a meron
texture or an in-plane polarized texture.
