Raman scattering studies of spin-waves in hexagonal BaFe12O 19

Nguyen Thi Minh Hien, Kiok Han, Xiang Bai Chen, Jung Chul Sur, In Sang Yang

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18 Scopus citations

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.

Original languageEnglish
Pages (from-to)2020-2024
Number of pages5
JournalJournal of Raman Spectroscopy
Volume43
Issue number12
DOIs
StatePublished - Dec 2012

Keywords

  • exchange integral
  • hexagonal BaFeO
  • Raman scattering
  • spin-order transition
  • spin-wave

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