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In bismuth ferrite thin films the cycloidal spiral spin structure issuppressed, and as a result the spin-wave magnon branches of long wavelengthare reduced from a dozen to one, at \omega = 19.2 cm-1 (T=4K). This spin wavehas not been measured previously above room temperature, but in the presentwork we show via Raman spectroscopy that it is an underdamped propagating waveuntil 455 K. This has important room-temperature device implications. The datashow that \omega(T) follows an S=5/2 Brillouin function and hence its Fe+3 ionsare in the high-spin 5/2 state and not the low-spin S=1/2 state. The spin wavecannot be measured as a propagating wave above 455 K. We also suggest thatsince this temperature is coincident with the mysterious "Polomska transition"(M. Polomska et al., Phys. Stat. Sol. A 23, 567, (1974)) at 458+/-5 K, thatthis may be due to overdamping.

High-temperature spin-wave propagation in BiFeO3: relation to the Polomska transition