Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic Bi Fe O 3
Abstract
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.
- Authors:
-
[4];
[4];
[4];
[5];
[6];
[8];
[9]
- Budapest University of Technology and Economics (Hungary); MTA-BME Condensed Matter Research Group (Hungary)
- Vienna Univ. of Technology (Austria); Budapest University of Technology and Economics (Hungary)
- Budapest University of Technology and Economics (Hungary); Univ. of Augsburg (Germany)
- National Institute of Chemical Physics and Biophysics (Estonia)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Inst. Laue-Langevin (ILL), Grenoble (France)
- AIST, Japan; National Institute of Advanced Industrial Science and Technology (AIST) (Japan)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Budapest University of Technology and Economics (Hungary); Hungarian Academy of Sciences, Budapest (Hungary)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Estonian Ministry of Education and Research; European Regional Development Fund; Estonian and Hungarian Academies of Sciences; Hungarian National Research, Development and Innovation Office; Austrian Science Fund (FWF); Austrian Agency for International Cooperation in Education and Research
- OSTI Identifier:
- 1885372
- Grant/Contract Number:
- AC05-00OR22725; IUT23-3; PRG736; TK134; NMK2018-47; ANN 122879; FK 135003; BME-IE-NAT; I 2816-N27; TAI 334-N; WTZ HU 08/2020
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: 17; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetoelectric effect; spin waves; multiferroics; small angle neutron scattering; Terahertz spectroscopy; spin-wave excitations; non-reciprocal directional dichroism
Citation Formats
Farkas, D. G., Szaller, D., Kezsmarki, I., Nagel, U., Room, T., Peedu, L., Viirok, J., White, J. S., Cubitt, R., Ito, T., Fishman, Randy, and Bordacs, S. Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO3. United States: N. p., 2021.
Web. doi:10.1103/physrevb.104.174429.
Farkas, D. G., Szaller, D., Kezsmarki, I., Nagel, U., Room, T., Peedu, L., Viirok, J., White, J. S., Cubitt, R., Ito, T., Fishman, Randy, & Bordacs, S. Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO3. United States. https://doi.org/10.1103/physrevb.104.174429
Farkas, D. G., Szaller, D., Kezsmarki, I., Nagel, U., Room, T., Peedu, L., Viirok, J., White, J. S., Cubitt, R., Ito, T., Fishman, Randy, and Bordacs, S. Mon .
"Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO3". United States. https://doi.org/10.1103/physrevb.104.174429. https://www.osti.gov/servlets/purl/1885372.
@article{osti_1885372,
title = {Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO3},
author = {Farkas, D. G. and Szaller, D. and Kezsmarki, I. and Nagel, U. and Room, T. and Peedu, L. and Viirok, J. and White, J. S. and Cubitt, R. and Ito, T. and Fishman, Randy and Bordacs, S.},
abstractNote = {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.},
doi = {10.1103/physrevb.104.174429},
journal = {Physical Review. B},
number = 17,
volume = 104,
place = {United States},
year = {Mon Nov 22 00:00:00 EST 2021},
month = {Mon Nov 22 00:00:00 EST 2021}
}
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