Atomic force micrographs of chemically etched ErMnO₃ crystals showing the evolution of ferroelectric vortex-antivortex domain patterns with varying cooling rates.

From the article:

Direct Observation of the Proliferation of Ferroelectric Loop Domains and Vortex-Antivortex Pairs
S. C. Chae, N. Lee, Y. Horibe, M. Tanimura, S. Mori, B. Gao, S. Carr, and S.-W. Cheong
Phys. Rev. Lett. 108, 167603 (2012)

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