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Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFe O3

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [4];  [4];  [4];  [5];  [6];  [7];  [8];  [9]
  1. Budapest University of Technology and Economics (Hungary); MTA-BME Condensed Matter Research Group (Hungary)
  2. Vienna Univ. of Technology (Austria); Budapest University of Technology and Economics (Hungary)
  3. Budapest University of Technology and Economics (Hungary); Univ. of Augsburg (Germany)
  4. National Institute of Chemical Physics and Biophysics (Estonia)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  6. Inst. Laue-Langevin (ILL), Grenoble (France)
  7. AIST, Japan; National Institute of Advanced Industrial Science and Technology (AIST) (Japan)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. Budapest University of Technology and Economics (Hungary); Hungarian Academy of Sciences, Budapest (Hungary)
Here, we report the magnetic-field dependence of the THz absorption and nonreciprocal directional dichroism spectra of BiFeO3 measured on the three principal crystal cuts for fields applied along the three principal directions of each cut. From the systematic study of the light polarization dependence, we deduced the optical selection rules of the spin-wave excitations. Our THz data, combined with small-angle neutron scattering results showed that (i) an in-plane magnetic field rotates the q vectors of the cycloids perpendicular to the magnetic field and (ii) the selection rules are mostly determined by the orientation of the q vector with respect to the electromagnetic fields. We observed a magnetic field history-dependent change in the strength and the frequency of the spin-wave modes, which we attributed to the change of the orientation and the length of the cycloidal q vector, respectively. Finally, we compared our experimental data with the results of linear spin-wave theory that reproduces the magnetic-field dependence of the spin-wave frequencies and most of the selection rules, from which we identified the spin-polarization coupling terms relevant for the optical magnetoelectric effect.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Austrian Agency for International Cooperation in Education and Research; Austrian Science Fund (FWF); Estonian Ministry of Education and Research; Estonian and Hungarian Academies of Sciences; European Regional Development Fund; Hungarian National Research, Development and Innovation Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1885372
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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