Phys. Rev. Lett. 102, 157203 (2009) [4 pages]Superexchange-Driven Magnetoelectricity in Magnetic VorticesReceived 17 October 2008; published 17 April 2009 We demonstrate that magnetic vortices in which spins are coupled to polar lattice distortions via superexchange exhibit an unusually large linear magnetoelectric response. We show that the periodic arrays of vortices formed by frustrated spins on kagome lattices provide a realization of this concept; our ab initio calculations for such a model structure yield a magnetoelectric coefficient that is 30 times larger than that of prototypical single phase magnetoelectrics. Finally, we identify the design rules required to obtain such a response in a practical material. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.157203
DOI:
10.1103/PhysRevLett.102.157203
PACS:
75.80.+q, 71.15.Mb, 75.25.+z, 75.30.Et
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