Identifying the spectroscopic modes of multiferroic BiFeO3

Randy S. Fishman; Nobuo Furukawa; Jason T. Haraldsen; Masaaki Matsuda; Shin Miyahara

doi:10.1103/PhysRevB.86.220402

Identifying the spectroscopic modes of multiferroic BiFeO₃

Randy S. Fishman, Nobuo Furukawa, Jason T. Haraldsen, Masaaki Matsuda, Shin Miyahara

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29 Scopus citations

Abstract

We have identified the modes of multiferroic BiFeO₃ measured by THz and Raman spectroscopies. Excellent agreement with the observed peaks is obtained by including the effects of easy-axis anisotropy along the direction of the electric polarization. By distorting the cycloidal spin state, anisotropy splits the Ψ_±1 mode into peaks at 20 and 21.5 cm ^-1 and activates the lower Φ_±2 mode at 27 cm^-1 (T=200 K). An electromagnon is identified with the upper Ψ_±1 mode at 21.5 cm^-1. Our results also explain recent inelastic neutron-scattering measurements.

Original language	English
Article number	220402
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.86.220402
State	Published - Dec 19 2012

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abstract = "We have identified the modes of multiferroic BiFeO3 measured by THz and Raman spectroscopies. Excellent agreement with the observed peaks is obtained by including the effects of easy-axis anisotropy along the direction of the electric polarization. By distorting the cycloidal spin state, anisotropy splits the Ψ±1 mode into peaks at 20 and 21.5 cm -1 and activates the lower Φ±2 mode at 27 cm-1 (T=200 K). An electromagnon is identified with the upper Ψ±1 mode at 21.5 cm-1. Our results also explain recent inelastic neutron-scattering measurements.",

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AU - Fishman, Randy S.

AU - Furukawa, Nobuo

AU - Haraldsen, Jason T.

AU - Matsuda, Masaaki

AU - Miyahara, Shin

PY - 2012/12/19

Y1 - 2012/12/19

N2 - We have identified the modes of multiferroic BiFeO3 measured by THz and Raman spectroscopies. Excellent agreement with the observed peaks is obtained by including the effects of easy-axis anisotropy along the direction of the electric polarization. By distorting the cycloidal spin state, anisotropy splits the Ψ±1 mode into peaks at 20 and 21.5 cm -1 and activates the lower Φ±2 mode at 27 cm-1 (T=200 K). An electromagnon is identified with the upper Ψ±1 mode at 21.5 cm-1. Our results also explain recent inelastic neutron-scattering measurements.

AB - We have identified the modes of multiferroic BiFeO3 measured by THz and Raman spectroscopies. Excellent agreement with the observed peaks is obtained by including the effects of easy-axis anisotropy along the direction of the electric polarization. By distorting the cycloidal spin state, anisotropy splits the Ψ±1 mode into peaks at 20 and 21.5 cm -1 and activates the lower Φ±2 mode at 27 cm-1 (T=200 K). An electromagnon is identified with the upper Ψ±1 mode at 21.5 cm-1. Our results also explain recent inelastic neutron-scattering measurements.

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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ER -

Identifying the spectroscopic modes of multiferroic BiFeO₃

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