Optical determination of the exchange stiffness constant in an iron garnet

Keita Matsumoto, Thomas Brächer, Philipp Pirro, Tobias Fischer, Dmytro Bozhko, Moritz Geilen, Frank Heussner, Thomas Meyer, Burkard Hillebrands, Takuya Satoh

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Abstract

Brillouin light scattering measurements were performed in the backscattering geometry on a Bi-substituted rare earth iron garnet. We observed two different peaks: One is attributed to a surface spin wave in the dipole-exchange regime while the other is referred to as a backscattering magnon mode, because the incident light in this case was scattered backward by exchange-dominated spin wave inside the material. We propose a method to estimate the exchange stiffness constant from the frequency of the backscattering magnon mode. The obtained value is comparable with the previously reported values for Y3Fe5O12.

Original languageEnglish
Article number070308
JournalJapanese Journal of Applied Physics
Volume57
Issue number7
DOIs
Publication statusPublished - Jul 2018

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Matsumoto, K., Brächer, T., Pirro, P., Fischer, T., Bozhko, D., Geilen, M., ... Satoh, T. (2018). Optical determination of the exchange stiffness constant in an iron garnet. Japanese Journal of Applied Physics, 57(7), [070308]. https://doi.org/10.7567/JJAP.57.070308