Optical properties of BiFeO3 ceramics in the frequency range 0.3–30.0 THz

Komandin, G. A.; Torgashev, V. I.; Волков, А. А.; Porodinkov, O. E.; Spektor, I. E.; Bush, A. A.

doi:10.1134/s1063783410040104

Cited by 46 publications

(46 citation statements)

References 35 publications

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“…Magnetic excitations at similar frequencies to our resonances have also been observed in single crystals using Raman scattering [23][24][25] and in submillimeter wave spectroscopy on BFO ceramics 28 . Fig.…”

Section: Pacs Numbersmentioning

confidence: 61%

“…The observation of magnetic resonance in optical transmission was first reported by Komandin et al 28 who studied BFO ceramics. They found four distinct magnetic resonance lines in the 20-30 cm −1 range at low temperature and an additional absorption in the 30-60 cm −1 range with a large dielectric contribution that was identified with an optical phonon.…”

Section: Pacs Numbersmentioning

confidence: 94%

“…These differences are likely explained by a combination of two factors, one of which is a sample-to-sample variation. The other is the appearance of additional lines in the spectra (in the work of Komandin et al 28 and in Raman spectroscopy [23][24][25] ), which can be accounted for by including single-ion anisotropy and DM terms in the magnetic free energy. As we have shown, a more realistic free energy than the one used by de Sousa and Moore 21 is needed for a detailed description of the magnetic resonance spectrum in BFO.…”

Section: Pacs Numbersmentioning

confidence: 99%

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Long-wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3

et al. 2011

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We present a terahertz spectroscopic study of magnetic excitations in ferroelectric antiferromagnet BiFeO 3 . We interpret the observed spectrum of long-wavelength magnetic resonance modes in terms of the normal modes of the material's cycloidal antiferromagnetic structure. We find that the modulated Dzyaloshinski-Moriya interaction leads to a splitting of the out-of-plane resonance modes. We also assign one of the observed absorption lines to an electromagnon excitation that results from the magnetoelectric coupling between the ferroelectric polarization and the cycloidal magnetic structure of BiFeO 3 .

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Section: Pacs Numbersmentioning

confidence: 61%

Section: Pacs Numbersmentioning

confidence: 94%

Section: Pacs Numbersmentioning

confidence: 99%

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Long-wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3

et al. 2011

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“…The three of them appearing up to 27 cm −1 correspond to the IRactive modes observed earlier by other authors. 15,26,31 In our spectra, they exhibit an enhanced damping in comparison with single-crystal data, mainly due to the fact that we measured un-polarized spectra. At 5 K, two modes are seen with peak absorption frequencies of 53 cm −1 and 56 cm −1 .…”

Section: Magnetic Excitations In Thz Spectra Of Bifeo3 Ceramicsmentioning

confidence: 86%

“…A possible explanation for such inconsistences between the various experimental results is the presence of oblique phonon modes, which show a continuous variation of frequency along the phonon propagation vector with respect to the crystallographic axis of the probed specimen. 11 Up to now, the phonon IR spectroscopy studies have been focused on ceramics [14][15][16] and single crystals, 17,18 whereas, to our knowledge, no report of a thin-film IR investigation exists.…”

Section: Introductionmentioning

confidence: 99%

Spin and lattice excitations of aBiFeO3thin film and ceramics

et al. 2015

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We present a comprehensive study of polar and magnetic excitations in BiFeO3 ceramics and a thin film epitaxially grown on an orthorhombic (110) TbScO3 substrate. Infrared reflectivity spectroscopy was performed at temperatures from 5 to 900 K for the ceramics and below room temperature for the thin film. All 13 polar phonons allowed by the factor-group analysis were observed in the ceramic samples. The thin-film spectra revealed 12 phonon modes only and an additional weak excitation, probably of spin origin. On heating towards the ferroelectric phase transition near 1100 K, some phonons soften, leading to an increase in the static permittivity. In the ceramics, terahertz transmission spectra show five low-energy magnetic excitations including two which were not previously known to be infrared active; at 5 K, their frequencies are 53 and 56 cm −1 . Heating induces softening of all magnetic modes. At a temperature of 5 K, applying an external magnetic field of up to 7 T irreversibly alters the intensities of some of these modes. The frequencies of the observed spin excitations provide support for the recently developed complex model of magnetic interactions in BiFeO3 (R.S. Fishman, Phys. Rev. B 87, 224419 (2013)). The simultaneous infrared and Raman activity of the spin excitations is consistent with their assignment to electromagnons.

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Raman spectroscopic investigations of epitaxial BiFeO₃ thin films on rare earth scandate substrates

Talkenberger

Vrejoiu

Johann

et al. 2015

J Raman Spectroscopy

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BiFeO 3 epitaxial thin films fabricated by pulsed laser deposition on different scandate substrates were investigated by means of Raman spectroscopy. We observed periodic changes in Raman position, full width at half maximum and intensity for some phonon modes as a function of the azimuthal angle ϕ. Further analysis revealed the possibility to assign the so far controversial discussed Raman modes at low wavenumbers (<250 cm À1 ) through rotational Raman measurements at different azimuthal angles, which show high sensitivity to the aforementioned parameters. Furthermore, the ferroelectric/ferroelastic domain structure shown by piezo-response force microscopy investigations of the samples was confirmed. Our results are supported by symmetry-based calculations including the analysis of Raman scattering geometry as well as the dielectric function of BiFeO 3 in the infrared range. Figure 7. (a) Raman spectra for the BiFeO 3 /DyScO 3 thin film with one Lorentzian mode in the range of 100-140 cm À1 . The experimental behaviour of Raman intensity, wavenumber and FWHM of this mode in relation to the azimuthal angle ϕ as well as the calculated behaviour (red dashed lines) is presented in (b), (c) and (d), respectively. Where the mode shows maxima for the wavenumber, minima in full width at half maximum can be detected and vice versa.Raman investigations of epitaxial BiFeO 3 thin films

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Optical properties of BiFeO3 ceramics in the frequency range 0.3–30.0 THz

Cited by 46 publications

References 35 publications

Long-wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3

Long-wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3

Spin and lattice excitations of aBiFeO3thin film and ceramics

Raman spectroscopic investigations of epitaxial BiFeO₃ thin films on rare earth scandate substrates

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Optical properties of BiFeO3 ceramics in the frequency range 0.3–30.0 THz

Cited by 46 publications

References 35 publications

Long-wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3

Long-wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3

Spin and lattice excitations of aBiFeO3thin film and ceramics

Raman spectroscopic investigations of epitaxial BiFeO3 thin films on rare earth scandate substrates

Contact Info

Product

Resources

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Raman spectroscopic investigations of epitaxial BiFeO₃ thin films on rare earth scandate substrates