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Raman scattering studies of spin-waves in hexagonal BaFe12O 19
- Raman scattering studies of spin-waves in hexagonal BaFe12O 19
- Hien N.T.M.; Han K.; Chen X.-B.; Sur J.C.; Yang I.-S.
- Ewha Authors
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- Journal of Raman Spectroscopy
- Journal of Raman Spectroscopy vol. 43, no. 12, pp. 2020 - 2024
- SCI; SCIE; SCOPUS
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- We present the results of polarized Raman spectroscopy of hexagonal BaFe12O19 single crystal. The spectra, recorded from 200 to 800 cm-1 and 1100 to 1700 cm-1 in the 20-250 K temperature range, are analyzed on the basis of both crystal vibrations and spin-waves. In the low wavenumber range, the Γ-point phonons are observed. In the high wavenumber range, phonon mixings are observed; more interestingly, four modes of spin-waves are identified in hexagonal BaFe12O 19. Both have not been studied previously. Our analyses of the spin-waves provide an optical method for quantitatively estimating the spin exchange interactions in hexagonal BaFe12O19. The four strong exchange integrals are found to have the values of Jce = 1.31 meV, Jae = 1.36 meV, Jcd = 1.46 meV, and Jbd = 1.71 meV. Our results also indicate that at ~200 and ~80 K, there would be additional spin-ordering transitions in hexagonal BaFe12O 19. Copyright © 2012 John Wiley & Sons, Ltd.
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