Array of magnetic vortices in CaAlMn₃O₇. Its strong spin-lattice coupling and symmetry breaking properties lead to a large magnetoelectric response.

From the article:

Superexchange-Driven Magnetoelectricity in Magnetic Vortices
Kris T. Delaney, Maxim Mostovoy, and Nicola A. Spaldin
Phys. Rev. Lett. 102, 157203 (2009)

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