Electric polarization induced by transverse magnetic field in the anisotropy-controlled conical helimagnet Ba2 (Mg1-x Znx) 2 Fe12 O22

S. Ishiwata, Y. Taguchi, Y. Tokunaga, H. Murakawa, Y. Onose, Y. Tokura

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Abstract

Microscopic origin of magnetic-field (B) induced electric polarization (P) potentially up to near room temperature has been investigated for helimagnets Ba2 (Mg1-x Znx) 2 Fe12 O22 with controlled magnetic anisotropy by revealing B - and x -dependent changes of magnetoelectric responses. As Zn concentration (x) increases, the B -induced P rapidly diminishes, accompanying the change in the magnetic-easy surface from conical to planar. Possible spin structures are proposed to explain the observed B dependence of P in terms of the spin-current model. The results indicate the important role of magnetic anisotropy in the B -induced ferroelectric state of this class of helimagnets.

Original languageEnglish
Article number180408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number18
DOIs
Publication statusPublished - 2009 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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