Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 11: Topical Session: TEM-Symposium - STEM
MM 11.4: Vortrag
Montag, 11. März 2013, 16:45–17:00, H4
A transmission electron microscopy study on highly strained BiFeO3 thin films — •Young Heon Kim1,2, Akash Bhatnagar1, Ji Hye Lee1, Marin Alexe1, Eckhard Pippel1, and Dietrich Hesse1 — 1Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany — 2Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea
BiFeO3 (BFO) has been widely studied for its astounding magnetoelectric properties, such as antiferromagnetism coupled with ferroelectricity. Although BFO is a rhombohedrally distorted multiferroic perovskite (R3c) in the bulk form, its structural stability is unclear in the form of thin films under strain. The misfit strain by lattice mismatch, one of constraints in thin film growth, causes the distortion of the bulk structure and/or the stabilization of novel phases. Several research groups have recently reported the formation of tetragonally distorted BFO phase (P4mm) on highly-lattice-mismatched substrates. In this talk, we present detailed investigation on the atomic structure and the phase behavior of highly strained BFO thin films, based on a transmission electron microscopy study. The transition information of the rhombohedral to tetragonal-like phase is considered to be a critical issue in achieving highly polarized BFO phase. The morphological and microstructural properties of BFO thin films were studied by various transmission and scanning transmission electron microscopy techniques (specially, with a probe Cs-corrector for atomic resolution in the latter case). We will also show geometrical phase analysis results adopted to determine strain distribution.