Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.1: Poster
Dienstag, 12. März 2013, 10:30–13:30, Poster D
Following Photo-Induced Strains in Multiferroic BiFeO3 Using Ultrafast X-Ray Diffraction — •Daniel Schick1, Marc Herzog1, Haidan Wen2, Peter Gaal3, and Matias Bargheer1 — 1Institut für Physik & Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany — 2X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA — 3Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Wilhelm-Conrad-Röntgen Campus, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
BiFeO3 had a deep impact in the field of multiferroics, since it is magnetic and ferroelectric at room temperature, opening a wide field of applications, e.g. for spintronics and memory devices which can be addressed magnetically and electrically. Furthermore, it is highly desirable to photo-control the polarization and magnetization in BiFeO3 directly by ultrafast optical excitation. Here we use femtosecond laser pulses with a photon-energy of 3.1eV (λ = 400nm) to excite a 40nm BiFeO3 thin film above its band gap of 2.8eV. Ultrafast X-Ray Diffraction (UXRD) at a laser-driven Plasma X-Ray Source (PXS) is applied to follow the subsequent lattice dynamics on a sub-picosecond timescale. We observe a fast evolution of the photo-induced strains in the excited BiFeO3 within 10ps. We compare these UXRD results with broadband all-optical experiments to get a deeper understanding of the origin of these strains in BiFeO3 induced by the interband excitation.