Dresden 2011 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.60: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Raman spectroscopic investigations of epitaxial BiCrO₃ thin films on different substrates — •Andreas Talkenberger¹, Kannan Vijayanandhini², Christian Röder¹, David Rafaja³, Miryam Arredondo², Ionela Vrejoiu², and Cameliu Himcinschi¹ — ¹TU Bergakademie Freiberg, Institute of Theoretical Physics, D-09596 Freiberg, Germany — ²Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany — ³TU Bergakademie Freiberg, Institute of Materials Science, D-09596 Freiberg, Germany

Multiferroic epitaxial thin films are of strong research interest due to their properties and potential applications for example in memory devices. In this work epitaxial BiCrO₃ (BCO) thin films deposited by pulsed laser deposition on SrTiO₃ (100), (LaAlO₃)_0.3-(Sr₂AlTaO₆)_0.7 (100) and NdGaO₃(110) substrates were investigated by Raman spectroscopy. The Raman spectra were measured from 87 K to room temperature using the 532 nm emission line of a Nd:YAG laser for excitation. The epitaxial relation between films and substrates was verified by analyzing high resolution transmission electron microscopy images, electron diffraction patterns, and polarization dependent Raman spectra considering that BCO crystallizes in the C2/c space group. The shift of phonon modes at room temperature indicates different strains in the BCO films grown on the three substrates. The optical phonon shift of the epitaxially strained BCO films was related to the strain determined from high resolution XRD measurements.

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