Comment on: "Ferroelectricity in spiral magnets"

Details Comment on: "Ferroelectricity in spiral magnets" Comment on: "Ferroelectricity in spiral magnets"

2006-10-17

arxiv.org/abs/cond-mat/0610471v1

Physics

Condensed Matter

Materials Science

Scientific paper

There is much interest in the physics of materials that show a strong coupling between magnetic and electric degrees of freedom. In a recent paper by Mostovoy a theory is presented that is based on symmetry arguments and leads to quite general claims which we feel merit some further analysis. In particular, Mostovoy concludes that "spiral magnets are, in general, ferroelectric". We argue that this conclusion is not generally valid, and that the symmetry of the unit cell has to be taken into account by any symmetry-based magneto-electric coupling theory. In an attempt to avoid further confusion in the search of new multiferroic materials, we identify in this Comment some of the necessary symmetry properties of spiral magnets that can lead to ferroelectricity.

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