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Raman scattering studies of spin-waves in hexagonal BaFe12O 19

Title
Raman scattering studies of spin-waves in hexagonal BaFe12O 19
Authors
Hien N.T.M.Han K.Chen X.-B.Sur J.C.Yang I.-S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2012
Journal Title
Journal of Raman Spectroscopy
ISSN
0377-0486JCR Link
Citation
vol. 43, no. 12, pp. 2020 - 2024
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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.
DOI
10.1002/jrs.4100
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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