We observed “one magnon,” scattering in multiferroicpolycrystalline Bi Fe O 3 thin films near 17.2 cm − 1 at 90 K employing Raman spectroscopy. It is seen with a kink in magnon intensity at 150 K and with strong anomaly near 210 K illustrating spin reorientation transition. The spectral weight of one magnon transferred to the lowest phonon mode near the spin reorientation temperature suggests magnon-phonon coupling. Dielectric constant and dielectric loss as function of temperature showed anomaly at 210 K suggesting magnon-phonon-electric dipole coupling. The one magnon becomes overdamped or overcome by elastic scattering at elevated temperatures.
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