Magnetic structures and excitations in a multiferroic Y-type hexaferrite
Abstract
Here, we have investigated magnetic orders and excitations in a Y-type hexaferrite BaSrCo2Fe11AlO22 (BSCoFAO), which was reported to exhibit spin-driven ferroelectricity at room temperature. By means of magnetization, electric polarization, and neutron-diffraction measurements using single-crystal samples, we establish a H-T magnetic phase diagram for magnetic field perpendicular to the c axis (H⟂c). This system exhibits an alternating longitudinal conical (ALC) magnetic structure in the ground state, and it turns into a non-co-planar commensurate magnetic order with spin-driven ferroelectricity under H⟂c. The field-induced ferroelectric phase remains as a metastable state after removing magnetic field below 250 K. This metastability is the key to understanding of magnetic field reversal of the spin-driven electric polarization in this system. Inelastic polarized neutron-scattering measurements in the ALC phase reveal a magnetic excitation at around 7.5 meV, which is attributed to spin components oscillating in a plane perpendicular to the cone axis. This phasonlike excitation is expected to be an electric-field active magnon, i.e., electromagnon excitation, in terms of the magnetostriction mechanism.
- Authors:
-
- RIKEN Center for Emergent Matter Science, Saitama (Japan)
- RIKEN Center for Emergent Matter Science, Saitama (Japan); Univ. of Tokyo, Kashiwa (Japan)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Univ. of Tennessee, Knoxville, TN (United States)
- RIKEN Center for Emergent Matter Science, Saitama (Japan); Japan Atomic Energy Agency, Ibaraki (Japan); Comprehensive Research Organization for Science and Society, Ibaraki (Japan)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1337864
- Alternate Identifier(s):
- OSTI ID: 1333977
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 19; 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
Citation Formats
Nakajima, Taro, Tokunaga, Yusuke, Matsuda, Masaaki, Dissanayake, Sachith E., Fernandez-Baca, Jaime A., Kakurai, Kazuhisa, Taguchi, Yasujiro, Tokura, Yoshinori, and Arima, Taka-hisa. Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.94.195154.
Nakajima, Taro, Tokunaga, Yusuke, Matsuda, Masaaki, Dissanayake, Sachith E., Fernandez-Baca, Jaime A., Kakurai, Kazuhisa, Taguchi, Yasujiro, Tokura, Yoshinori, & Arima, Taka-hisa. Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22. United States. https://doi.org/10.1103/PhysRevB.94.195154
Nakajima, Taro, Tokunaga, Yusuke, Matsuda, Masaaki, Dissanayake, Sachith E., Fernandez-Baca, Jaime A., Kakurai, Kazuhisa, Taguchi, Yasujiro, Tokura, Yoshinori, and Arima, Taka-hisa. 2016.
"Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22". United States. https://doi.org/10.1103/PhysRevB.94.195154. https://www.osti.gov/servlets/purl/1337864.
@article{osti_1337864,
title = {Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22},
author = {Nakajima, Taro and Tokunaga, Yusuke and Matsuda, Masaaki and Dissanayake, Sachith E. and Fernandez-Baca, Jaime A. and Kakurai, Kazuhisa and Taguchi, Yasujiro and Tokura, Yoshinori and Arima, Taka-hisa},
abstractNote = {Here, we have investigated magnetic orders and excitations in a Y-type hexaferrite BaSrCo2Fe11AlO22 (BSCoFAO), which was reported to exhibit spin-driven ferroelectricity at room temperature. By means of magnetization, electric polarization, and neutron-diffraction measurements using single-crystal samples, we establish a H-T magnetic phase diagram for magnetic field perpendicular to the c axis (H⟂c). This system exhibits an alternating longitudinal conical (ALC) magnetic structure in the ground state, and it turns into a non-co-planar commensurate magnetic order with spin-driven ferroelectricity under H⟂c. The field-induced ferroelectric phase remains as a metastable state after removing magnetic field below 250 K. This metastability is the key to understanding of magnetic field reversal of the spin-driven electric polarization in this system. Inelastic polarized neutron-scattering measurements in the ALC phase reveal a magnetic excitation at around 7.5 meV, which is attributed to spin components oscillating in a plane perpendicular to the cone axis. This phasonlike excitation is expected to be an electric-field active magnon, i.e., electromagnon excitation, in terms of the magnetostriction mechanism.},
doi = {10.1103/PhysRevB.94.195154},
url = {https://www.osti.gov/biblio/1337864},
journal = {Physical Review B},
issn = {2469-9950},
number = 19,
volume = 94,
place = {United States},
year = {Wed Nov 30 00:00:00 EST 2016},
month = {Wed Nov 30 00:00:00 EST 2016}
}
Web of Science
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