Multiferroicity in NiBr2 with long-wavelength cycloidal spin structure on a triangular lattice

Y. Tokunaga, D. Okuyama, T. Kurumaji, T. Arima, H. Nakao, Y. Murakami, Y. Taguchi, Y. Tokura

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28 Citations (Scopus)


Multiferroic properties have been investigated for single crystals of the triangular-lattice antiferromagnet NiBr2 with long-wavelength (∼7 nm) cycloidal spin structure whose spin-spiral plane is parallel to (001). X-ray diffraction revealed a magnetoelastic lattice modulation with half the periodicity of the magnetic modulation below the cycloidal ordering temperature (TIC∼23 K), indicating the elliptically distorted nature of the transverse helix. Field-reversible spontaneous polarization (P) appears in the [11̄0] direction perpendicular to the spin rotation axis ([001]) below TIC. P shows nontrivial dependence on the magnitude and direction of the poling magnetic field (H), suggesting the possible H selection of the propagation vector of the helix from the sixfold-degenerate directions, even for the in-plane cycloidal spin structure, through magnetic domain control in the higher-temperature spin-collinear antiferromagnetic phase.

Original languageEnglish
Article number060406
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number6
Publication statusPublished - 2011 Aug 26
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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