Electromagnon excitation in the field-induced nonlinear ferrimagnetic phase of Ba2Mg2Fe12O22 studied by polarized inelastic neutron and terahertz time-domain optical spectroscopy

Nakajima, Taro; Takahashi, Youtarou; Kibayashi, Shunsuke; Matsuda, Masaaki; Kakurai, Kazuhisa; Ishiwata, Shintaro; Taguchi, Yasujiro; Tokura, Yoshinori; Arima, Taka-hisa

doi:10.1103/PhysRevB.93.035119

Title: Electromagnon excitation in the field-induced nonlinear ferrimagnetic phase of Ba₂Mg₂Fe₁₂O₂₂ studied by polarized inelastic neutron and terahertz time-domain optical spectroscopy

Journal Article · Tue Jan 19 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.035119· OSTI ID:1266005

Nakajima, Taro ^[1]; Takahashi, Youtarou ^[2]; Kibayashi, Shunsuke ^[3]; Matsuda, Masaaki ^[4]; Kakurai, Kazuhisa ^[5]; Ishiwata, Shintaro ^[3]; Taguchi, Yasujiro ^[1]; Tokura, Yoshinori ^[6]; Arima, Taka-hisa ^[7]

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.

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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

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Cited by: 11 works

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Electromagnon Resonance at Room Temperature with Gigantic Magnetochromism Shishikura, H.; Tokunaga, Y.; Takahashi, Y. Physical Review Applied, Vol. 9, Issue 4 https://doi.org/10.1103/physrevapplied.9.044033	journal	April 2018
Study of the Structural and Magnetic Properties of Co-Substituted Ba2Mg2Fe12O22 Hexaferrites Synthesized by Sonochemical Co-Precipitation Koutzarova, Tatyana; Kolev, Svetoslav; Krezhov, Kiril Materials, Vol. 12, Issue 9 https://doi.org/10.3390/ma12091414	journal	April 2019
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Title: Electromagnon excitation in the field-induced nonlinear ferrimagnetic phase of Ba2Mg2Fe12O22 studied by polarized inelastic neutron and terahertz time-domain optical spectroscopy

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Title: Electromagnon excitation in the field-induced nonlinear ferrimagnetic phase of Ba₂Mg₂Fe₁₂O₂₂ studied by polarized inelastic neutron and terahertz time-domain optical spectroscopy