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MA: Fachverband Magnetismus

MA 3: Multiferroics 2 (jointly wth DF,DS,KR,TT)

MA 3.8: Vortrag

Montag, 11. März 2013, 17:00–17:15, H3

Ferroelectric properties of (Ba,Sr)TiO₃/La_0.7Sr_0.3MnO₃ multilayered thin films — •Markus Michelmann¹, Johannes Aprojanz^1,2, Arseni Buryakov², Elena Mishina², Markus Jungbauer¹, Sebastian Hühn¹, 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

Ba_xSr_1−xTiO₃ (BSTO) epitaxial thin films became feasible for room temperature applications in contrast to the bulk material due to a possibility to enhance the ferroelectric Curie temperature under biaxial compressive strain. Using La_0.7Sr_0.3MnO₃ (LSMO) thin films as metallic electrodes, we have grown highly strained BSTO/LSMO bilayers and LSMO/BSTO/LSMO trilayers on SrTiO₃ (100) substrates with BSTO layer thicknesses of 10 - 200 nm by means of metalorganic aerosol deposition. Ferroelectric switching was studied both electrically and by nonlinear optics (second harmonic generation (SHG)). Capacitance-voltage characteristics in a frequency range of f = 1 − 10⁶ Hz and PUND measurements prove a ferroelectric hysteretic behavior up to room temperature with a remanent polarization of several µ C/cm² and a switching fields in the range of 10 − 100 kV/cm. This was also supported by the SHG measurements. A detailed study of multiferroic properties will be performed for temperatures, T = 10 − 400 K, and applied magnetic field, B = 0 − 9 T. This work was supported by IFOX of the European Community’s 7th Framework Programme.