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Multiferroic magnetic spirals induced by random magnetic exchanges

Scaramucci, Andrea ; Shinaoka, Hiroshi ; Mostovoy, Maxim V. ; Müller, Markus ; Mudry, Christopher ; Troyer, Matthias ; Spaldin, Nicola A.

In: Physical Review X, 2018, vol. 8, no. 1, p. 011005

Multiferroism can originate from the breaking of inversion symmetry caused by magnetic-spiral order. The usual mechanism for stabilizing a magnetic spiral is competition between magnetic exchange interactions differing by their range and sign, such as nearest-neighbor and next-nearest-neighbor interactions. In insulating compounds, it is unusual for these interactions to be both comparable in...