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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2009 May 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics