Berlin 2015 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

DF: Fachverband Dielektrische Festkörper

DF 5: Poster Session on Ferroic Domain Walls - Multiferroics (DF with KR/MA/TT)

DF 5.21: Poster

Monday, March 16, 2015, 19:00–21:00, Poster C

Investigation of low-frequency Raman modes in BiFeO₃ epitaxial thin films with respect to azimuthal orientation — •Andreas Talkenberger¹, Cameliu Himcinschi¹, Christian Röder¹, Ionela Vrejoiu^2,3, Florian Johann², and Jens Kortus¹ — ¹TU Bergakademie Freiberg, Institute of Theoretical Physics, Leipziger Str. 23, D-09596 Freiberg — ²Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle — ³Max Planck Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart

In this work we present results of highly accurate Raman spectroscopic experiments applied in azimuthal rotation measurements on epitaxial BiFeO₃ thin films grown on different scandate substrates. We observe periodic changes in Raman position, full width at half maximum and intensity for some phonon modes as a function of the azimuthal angle Φ. Further analysis revealed the possibility of the so far controversial assignment of Raman modes at low frequencies (< 250 cm⁻¹) through rotational Raman measurements, that show high sensitivity towards the mentioned parameters. We successfully simulated the azimuthal behaviour of Raman intensity and position of selected modes offering a symmetry assignment for them. In addition our results support the domain character of the BFO/DSO thin film identified by piezoresponse-force microscopy measurements.

This work is supported by the German Research Foundation DFG HI 1534/1-2.