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Title: Giant Spin-Driven Ferroelectric Polarization in BiFeO3 at Room Temperature

Although BiFeO3 is the most extensively investigated multiferroic material, its magnetoelectic couplings are barely understood. Here we report a thorough study of the magentoelectric (ME) couplings in spin-cycloidal buk BiFeO3 using first-principles calculations and microscopic spin-wave models compared with neutron-scattering measurements. We find that huge exchange-striction (ES) polarizations, i.e. the electric response of the magnetic exchange through ferroelectric and antiferrodistortive distortions, is giant enough to dominate over all other ME couplings. We show that BiFeO3 has a hidden record-high spin-driven polarization ( 3 C/cm2) at room-temperature. The huge ES polarizations can be tuned by coupling to the antiferrodistortive rotations.
 [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 20; Journal ID: ISSN 0031-9007
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)z; USDOE
Country of Publication:
United States
36 MATERIALS SCIENCE; magnetoelectric couplings; spin-driven polarization