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<p>We present a theoretical framework for detecting terahertz (THz) magnons in ferrimagnetic materials using magneto-Raman spectroscopy with yttrium iron garnet (YIG) as a prototypical system. By applying the Holstein–Primakoff transformation to a two-sublattice ferrimagnet, we derive magnon eigenfrequencies and demonstrate that the optical magnon mode scales proportionally with the net magnetization, consistent with a Kaplan–Kittel-type phenomenological description. Symmetry analysis based on Raman tensors and magneto-optical coupling reveals polarization-dependent selection rules, enabling the identification of Raman-active magnon modes, distinguished from phonon excitations. Furthermore, we quantitatively evaluate the spectral energy resolution of a practical Raman spectroscopy setup and show that it is sufficient to resolve intrinsic THz magnon features. Our results establish a comprehensive theoretical basis for quantitative magnon detection via Raman spectroscopy and highlight magneto-Raman measurements as a powerful alternative to conventional neutron scattering for probing high-frequency spin dynamics and THz magnons.</p>

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Theoretical estimation of THz magnon detection by Raman spectroscopy

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Fathiya Rahmani,
  • Priyanka Das,
  • Anabil Gayen,
  • Qoimatul Mustaghfiroh,
  • Dong-Hyun Kim

摘要

We present a theoretical framework for detecting terahertz (THz) magnons in ferrimagnetic materials using magneto-Raman spectroscopy with yttrium iron garnet (YIG) as a prototypical system. By applying the Holstein–Primakoff transformation to a two-sublattice ferrimagnet, we derive magnon eigenfrequencies and demonstrate that the optical magnon mode scales proportionally with the net magnetization, consistent with a Kaplan–Kittel-type phenomenological description. Symmetry analysis based on Raman tensors and magneto-optical coupling reveals polarization-dependent selection rules, enabling the identification of Raman-active magnon modes, distinguished from phonon excitations. Furthermore, we quantitatively evaluate the spectral energy resolution of a practical Raman spectroscopy setup and show that it is sufficient to resolve intrinsic THz magnon features. Our results establish a comprehensive theoretical basis for quantitative magnon detection via Raman spectroscopy and highlight magneto-Raman measurements as a powerful alternative to conventional neutron scattering for probing high-frequency spin dynamics and THz magnons.