Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 27: Postersession KFM

KFM 27.2: Poster

Donnerstag, 15. März 2018, 15:00–17:00, Poster E

Ferroelastic domain identification in BiFeO3 crystals using Raman spectroscopy — •Jan Rix1, Cameliu Himcinschi1, Christian Röder1, Martin Rudolph2, Mingmin Yang3, David Rafaja2, Jens Kortus1, and Marin Alexe31Institute of Theoretical Physics, TU Bergakademie Freiberg, 09596 Freiberg, Germany — 2Institute of Materials Science, TU Bergakademie Freiberg, 09596 Freiberg, Germany — 3Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

Multiferroic BiFeO3 crystals have been investigated by means of Raman spectroscopy using 442 nm (resonant conditions) and 633 nm (non-resonant conditions) laser wavelengths. The azimuthal angular dependence of the intensity of the Raman modes allowed an assignment to one of five symmetry characters, which are present in the directional dispersion [1,2]. Mixed symmetries were taken in account, considering the orientation of the optical c-axis along the pseudo-cubic <111>pc direction. The experimental data have been verified by a Raman tensor formalism simulation. The strong intensity variation of the polar Raman modes at   138 cm−1 (ETO - A1TO) and at   172 cm−1 (A1LO - ELO) were used for line scans, mappings and a depth profile in order to identify the elastic domain patterns. The distribution of domains found by Raman spectroscopy is in very good agreement with the domain pattern revealed by Electron Back Scattering Diffraction (EBSD) and Piezo-Force Microscopy (PFM).

[1] J. Hlinka et al. Phys. Rev. B 83, 020101 (2011). [2] A. Talkenberger et al. J. Raman Spectrosc. 46, 1245 (2015).

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