Abstract
The phonon properties of multiferroicBiFeO3 (BFO) nanoparticles are studied using a Green’s function technique on the basis of theHeisenberg and the transverse Ising models, taking into account anharmonic spin–phononand phonon–phonon interaction terms. The phonon spectrum is obtained for differentexchange, magnetoelectric, and spin–phonon interaction constants. The influence oftemperature, surface and size effects on the phonon energy and damping is discussed. Thephonon energy and damping in BFO nanoparticles are greater in comparison to those inbulk BFO. The strong spin–phonon interactions lead to anomalies in the phonon spectrumaround the magnetic and ferroelectric phase transitions. The influence of an appliedmagnetic field is studied, too. The predictions are consistent with experimentalresults.
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