Electromagnon excitation in the field-induced nonlinear ferrimagnetic phase of Ba2Mg2Fe12O22 studied by polarized inelastic neutron and terahertz time-domain optical spectroscopy
- RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan)
- Univ. of Tokyo, Tokyo (Japan); Japan Science and Technology Agency, Tokyo (Japan)
- Univ. of Tokyo, Tokyo (Japan)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan); Japan Atomic Energy Agency, Ibaraki (Japan)
- RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan); Univ. of Tokyo, Tokyo (Japan)
- RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan); Univ. of Tokyo, Kashiwa (Japan)
We have studied magnetic excitations in a field-induced noncollinear commensurate ferrimagnetic phase of Ba2Mg2Fe12O22 by means of polarized inelastic neutron scattering (PINS) and terahertz (THz) time-domain optical spectroscopy under magnetic field. A previous THz spectroscopy study reported that the field-induced phase exhibits electric-dipole-active excitations with energies of around 5 meV [Kida et al., Phys. Rev. B 83, 064422 (2011)]. In the present PINS measurements, we observed inelastic scattering signals around 5 meV at the zone center in the spin-flip channel. This directly shows that the electric-dipole-active excitations are indeed of magnetic origin, that is, electromagnons. In addition, the present THz spectroscopy confirms that the excitations have oscillating electric polarization parallel to the c axis. In terms of the spin-current model (Katsura-Nagaosa-Balatsky model), the noncollinear magnetic order in the field-induced phase can induce static electric polarization perpendicular to the c axis, but not dynamic electric polarization along the c axis. Furthermore, we suggest that the electromagnon excitations can be explained by applying the magnetostriction model to the out-of-phase oscillations of the magnetic moments, which is deduced from the present experimental results.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; IPTS-11376.1
- OSTI ID:
- 1266005
- Alternate ID(s):
- OSTI ID: 1235785
- Journal Information:
- Physical Review B, Vol. 93, Issue 3; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Electromagnon Resonance at Room Temperature with Gigantic Magnetochromism
|
journal | April 2018 |
Study of the Structural and Magnetic Properties of Co-Substituted Ba2Mg2Fe12O22 Hexaferrites Synthesized by Sonochemical Co-Precipitation
|
journal | April 2019 |
Giant magnetoelectric effects achieved by tuning spin cone symmetry in Y-type hexaferrites
|
journal | September 2017 |
Electromagnon in the Y-type hexaferrite
|
journal | April 2018 |
Similar Records
Far-IR magnetospectroscopy of magnons and electromagnons in single crystals at low temperatures
Magnetoelectric effects in the spin-1/2 XXZ model with Dzyaloshinskii-Moriya interaction