Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Magnetic Half-metals and Oxides II

MA 19.4: Vortrag

Mittwoch, 24. März 2010, 16:00–16:15, H22

Ultrafast optical and X-ray studies of multifunctional oxide multilayers — •Marc Herzog¹, Wolfram Leitenberger¹, Roman Shayduk², and Matias Bargheer¹ — ¹Universität Potsdam, Institut für Physik und Astronomie — ²Helmholtz-Zentrum Berlin für Materialien und Energie

We compare ultrafast optical and x-ray measurements on epitaxial multifunctional oxide multilayers possessing a perovskite crystal structure arranged in alternating layers of ferromagnetic (FM) metals and paraelectric/ferroelectric insulators. The FM oxides include (La_2/3Sr_1/3)MnO₃ and SrRuO₃ while the non-metallic layers are built from Pb(Zr_0.2Ti_0.8)O₃ and SrTiO₃. All-optical pump-probe experiments across the FM transition temperature are presented and optical pump - x-ray probe measurements at room temperature evidence the excitation of coherent acoustic phonon modes leading to drastic modulations of the X-ray diffraction patterns on a 1-ps time scale. These measurements allow for an accurate calibration of all-optical experiments regarding the amplitude of lattice motion.