Relaxation dynamics of multiferroic domain walls in DyMnO3 with cycloidal spin order

F. Kagawa, Y. Onose, Y. Kaneko, Y. Tokura

研究成果: Article査読

17 被引用数 (Scopus)


Dynamic responses of various types of spin-cycloidal domain walls (DWs) have been investigated for the multiferroic compound DyMnO3 by the dielectric measurements. By exploiting the multiferroic nature of this material, we were able to drive the spin-cycloidal DWs by an electric field and hence elucidate the dynamics in terms of the frequency-dependent dielectric susceptibility. In the 103-109-Hz range, all types of DWs exhibit relaxation motion. In some DWs, the relaxation motion presents critical behavior near the first-order flop transition of the ferroelectric spin-cycloidal plane; that is, the dielectric constant is enhanced, and the dynamics slow down. The theory of DW relaxation ascribes this behavior to the growing Larkin length. This observation of the Larkin length along with generic considerations of DW widths and flop transitions implies that the critical behavior of DW relaxation is universal in materials that exhibit a flop transition, for example, of spin or polarization. Multiferroic compounds can thus provide an ideal laboratory for the study of magnetic DW dynamics.

ジャーナルPhysical Review B - Condensed Matter and Materials Physics
出版ステータスPublished - 2011 2月 11

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学


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