Abstract
The phonon properties of multiferroic hexagonalRMnO3 thin films are studied based on a microscopic model including anharmonic spin–phononinteractions. We obtain an anomaly near the magnetic phase transition temperatureTN which can be attributed to the magnetoelectric nature ofRMnO3 and a strong spin–phonon interaction. The size and surface effects on the phononproperties are discussed. It is demonstrated that the phonon energies can be larger orsmaller for different substrates or doping ions, whereas their damping is alwaysenhanced. The influence of an external magnetic field on the phonon properties isobserved.
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