Abstract
AbstractWe report the first examination of the influence of Faraday rotation on the selection rule of phonon Raman scattering in magnetic materials. It is shown that the original selection rule for phonons will no longer be valid owing to the introduction of Faraday rotation. By applying a transverse ( is the direction of light propagation) or a longitudinal () magnetic field, the effect of Faraday rotation can be switched off or on. The changes of the intensity and mode structure of phonon scattering in the two configurations are related directly to the absorption and the magneto‐optical figure of merit, Q ( = θF/2α, where θF is the specific Faraday rotation and α is the coefficient of absorption). The result also shows that introducing Faraday rotation offers a new chance of identifying some vibration modes which are otherwise impossible. Taking garnet (O) as example, the relationship between phonon scattering intensities and Faraday rotation and absorption was calculated for typical scattering configurations. The results can be checked experimentally using magnetic materials with suitable Q values.
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