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Title: Giant Spin-Driven Ferroelectric Polarization in BiFeO 3 at Room Temperature

Although BiFeO 3 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 BiFeO 3 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 BiFeO 3 has a hidden record-high spin-driven polarization ( 3 C/cm 2) at room-temperature. The huge ES polarizations can be tuned by coupling to the antiferrodistortive rotations.
Authors:
 [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 20; Journal ID: ISSN 0031-9007
Publisher:
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 Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; magnetoelectric couplings; spin-driven polarization
OSTI Identifier:
1286779
Alternate Identifier(s):
OSTI ID: 1225763

Lee, Jun Hee, and Fishman, Randy S. Giant Spin-Driven Ferroelectric Polarization in BiFeO3 at Room Temperature. United States: N. p., Web. doi:10.1103/PhysRevLett.115.207203.
Lee, Jun Hee, & Fishman, Randy S. Giant Spin-Driven Ferroelectric Polarization in BiFeO3 at Room Temperature. United States. doi:10.1103/PhysRevLett.115.207203.
Lee, Jun Hee, and Fishman, Randy S. 2015. "Giant Spin-Driven Ferroelectric Polarization in BiFeO3 at Room Temperature". United States. doi:10.1103/PhysRevLett.115.207203. https://www.osti.gov/servlets/purl/1286779.
@article{osti_1286779,
title = {Giant Spin-Driven Ferroelectric Polarization in BiFeO3 at Room Temperature},
author = {Lee, Jun Hee and Fishman, Randy S.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.115.207203},
journal = {Physical Review Letters},
number = 20,
volume = 115,
place = {United States},
year = {2015},
month = {11}
}