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Raman scattering measurements on BiFeO3 single crystals show an importantcoupling between the magnetic order and lattice vibrations. The temperatureevolution of phonons shows that the lowest energy E and A1 phonon modes arecoupled to the spin order up to the Neel temperature. Furthermore, lowtemperature anomalies associated with the spin re-orientation are observedsimultaneously in both the E phonon and the magnon. These results suggest thatmagnetostriction plays an important role in BiFeO3.

Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals