Dresden 2020 – wissenschaftliches Programm
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DS 31.7: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P1A
Structure and Ferroelectricity in Strain-Stabilized Hexagonal TbMnO3 Thin Films — •Moritz Hirsbrunner1, Rajesh Mandal2, Daniel Steil1, Karen Stroh1, and Vasily Moshnyaga1 — 1Erstes Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany — 2SRF, Department of Physics, Indian Institute of Science Education and Research, Pune, India-411008
Rare-earth-manganite-based multiferroic materials are of great interest because of their strong coupling of magnetic and electronic systems, resulting in cross-controlled magnetoelectric properties. Hexagonal TbMnO3 (h-TMO) films with room temperature ferroelectricity (FE) is of particular importance. Bulk TMO displays orthorhombic structure and exhibits FE with low polarization 0.06 μC/cm2 and ferromagnetism (FM) well below 100K. However, stabilization of hexagonal structure in TMO thin films by epitaxy strain was shown to result in a much larger room temperature polarization (8 μC/cm2). We optimized the growth of h-TMO thin films on YSZ(111) substrates by Metalorganic Aerosol Deposition (MAD) by varying the precursor ratio, substrate temperature, growth and cooling rate. X-ray diffraction (XRD) confirms the hexagonal structure of the films, showing a smooth surface with RMS ~0.3nm (AFM). Furthermore, optical spectroscopy and second harmonic generation (SHG) were measured to characterize the ferroelectricity of h-TbMnO3. The financial support of DFG via SFB1073 (A02, A06) is acknowledged.