Dresden 2017 – wissenschaftliches Programm
DF 9.18: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1C
Raman spectroscopic investigations of domains in multiferroic BiFeO3 crystals — •Jan Rix1, Cameliu Himcinschi1, Jens Kortus1, Christian Röder1, and Marin Alexe2 — 1TU Bergakademie Freiberg, Institute of Theoretical Physics, D-09596 Freiberg, Germany — 2Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
Multiferroic BiFeO3 crystals were investigated at room temperature by means of Raman spectroscopy using the 442 nm line of a HeCd laser. Considering the direction of polarisation of the incoming and the scattered beam, characteristic spectra were revealed. These spectra can be attributed to two different types of domains, which differ in the orientation of the pseudo-cubic <111>pc direction. The strong intensity variation of the polar Raman mode at 175 cm−1 (A1(LO) -> E(LO)) was used for domain identification by line scans and mappings. In addition, simulations by means of the Raman tensor formalism proof the experimental findings. This method is a viable alternative to polarisation microscopy and offers opportunities for further studies of ferroelastic domains in BiFeO3.