Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.10: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Nonlinear optical probing in (Ba,Sr)TiO₃/La_0.7Sr_0.3MnO₃ multilayers — •Johannes Aprojanz^1,2, Arseni Buryakov², Elena Mishina², Markus Michelmann¹, and Vasily Moshnyaga¹ — ¹I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen — ²Moscow State Institute of Radioengineering, Electronics and Automation, Prosp. Vernadskogo 78, 119454 Moscow, Russia

Ferroelectric oxides stand out due to their excellent nonlinear optical properties and strong electro-optic effect, which offer promising applications as electro-optical modulators. Second harmonic generation (SHG) as a nonlinear optical probe is a powerful tool for studying ferroelectric switching, since it gives direct insight into the domain state in the material. In this work, we report on SHG measurements on Ba_xSr_1−xTiO₃/La_0.7Sr_0.3MnO₃ (BSTO/LSMO), x = 0.15 − 0.5, multilayers grown on SrTiO₃ substrates by means of metalorganic aerosol deposition (MAD). The voltage characteristics of SHG-signal prove ferroelectric hysteretic behavior at room temperature with switching fields in the range of 100 kV/cm. A detailed study of ferroelectric properties will be given as a function of magnetic field, B = 0 − 1 T. This work was supported by IFOX of the European Community’s 7th Framework Programme.