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Title: Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1416836
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 2; Related Information: CHORUS Timestamp: 2018-01-12 10:09:05; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Chun, Sae Hwan, Shin, Kwang Woo, Kim, Hyung Joon, Jung, Seonghoon, Park, Jaehun, Bahk, Young-Mi, Park, Hyeong-Ryeol, Kyoung, Jisoo, Choi, Da-Hye, Kim, Dai-Sik, Park, Gun-Sik, Mitchell, J. F., and Kim, Kee Hoon. Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.027202.
Chun, Sae Hwan, Shin, Kwang Woo, Kim, Hyung Joon, Jung, Seonghoon, Park, Jaehun, Bahk, Young-Mi, Park, Hyeong-Ryeol, Kyoung, Jisoo, Choi, Da-Hye, Kim, Dai-Sik, Park, Gun-Sik, Mitchell, J. F., & Kim, Kee Hoon. Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite. United States. doi:10.1103/PhysRevLett.120.027202.
Chun, Sae Hwan, Shin, Kwang Woo, Kim, Hyung Joon, Jung, Seonghoon, Park, Jaehun, Bahk, Young-Mi, Park, Hyeong-Ryeol, Kyoung, Jisoo, Choi, Da-Hye, Kim, Dai-Sik, Park, Gun-Sik, Mitchell, J. F., and Kim, Kee Hoon. 2018. "Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite". United States. doi:10.1103/PhysRevLett.120.027202.
@article{osti_1416836,
title = {Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite},
author = {Chun, Sae Hwan and Shin, Kwang Woo and Kim, Hyung Joon and Jung, Seonghoon and Park, Jaehun and Bahk, Young-Mi and Park, Hyeong-Ryeol and Kyoung, Jisoo and Choi, Da-Hye and Kim, Dai-Sik and Park, Gun-Sik and Mitchell, J. F. and Kim, Kee Hoon},
abstractNote = {},
doi = {10.1103/PhysRevLett.120.027202},
journal = {Physical Review Letters},
number = 2,
volume = 120,
place = {United States},
year = 2018,
month = 1
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 12, 2019
Publisher's Accepted Manuscript

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  • In this Letter, we investigate the magnetic and multiferroic properties of a W-type hexaferrite SrZn{sub 1.15}Co{sub 0.85}Fe{sub 16}O{sub 27}. Due to the strong planar contribution to the anisotropy provided by Co{sup 2+} ions, this hexaferrite shows a spin reorientation transition from easy-axis to easy-cone at 302 K, which is different from the onset temperature of ferroelectric polarization, 275 K. By applying magnetic field, a remarkable drop of polarization is observed, suggesting a large magnetoelectric effect in this multiferroics. The difference between spin reorientation and ferroelectric phase transition temperature as well as the origin of magnetoelectric effect are discussed.
  • The room-temperature multiferroic and magnetocapacitance (MC) effects of polycrystalline M-type hexaferrite BaFe{sub 10.2}Sc{sub 1.8}O{sub 19} have been investigated. The results show that the magnetic moments of insulating BaFe{sub 10.2}Sc{sub 1.8}O{sub 19} can be manipulated by the electric field at room temperature, indicating the existence of magnetoelectric coupling. Moreover, large MC effects are also observed around the room temperature. A frequency dependence analysis shows that the Maxwell-Wagner type magnetoresistance effect is the dominant mechanism for MC effects at low frequencies. Both the magnetoelectric-type and non-magnetoelectric-type spin-phonon couplings contribute to the MC effects at high frequencies with the former being the dominantmore » mechanism. The above results show that the hexaferrite BaFe{sub 10.2}Sc{sub 1.8}O{sub 19} is a room-temperature multiferroic material that can be potentially used in magnetoelectric devices.« less
  • We have studied magnetic excitations in a field-induced noncollinear commensurate ferrimagnetic phase of Ba 2Mg 2Fe 12O 22 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. Inmore » 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.« less
  • In this paper, single-phase multiferroic ceramics of (1 - x) BaTiO{sub 3}-x BiFeO{sub 3} (BT - x BFO) were synthesized by solid-solution method in the wide range of material composition (x = 0.025 - 1.0). The changes in crystal structure were confirmed via X-ray diffractions (XRD) and atomic pair distribution functions (PDFs). The room-temperature ME coupling was found to exhibit significant magnitude in the narrow composition window (x = 0.71 - 0.8) where the average crystal structure was found to be rhombohedral. Especially, the BT - 0.725 BFO ceramics containing local monoclinic distortions within rhombohedral phase were found to exhibitmore » high room-temperature ME coefficient ({alpha}{sub ME}) of 0.87 mV/cm{center_dot}Oe with high piezoelectric properties (g{sub 33} = 18.5 Multiplication-Sign 10 mV m N{sup -1} and d{sub 33} = 124 pC N{sup -1}). We believe that the high room-temperature ME coupling in single-phase lead-free BT-BFO ceramics provides a possibility of developing electrically or magnetically tunable thin-film devices.« less