Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
MA 20.71: Poster
Tuesday, March 27, 2012, 12:15–15:15, Poster A
Ultrafast, layer-selective dynamics of interlayer exchange-coupled Fe-Ru-Ni-trilayers — •Dennis Rudolf1, Patrik Grychtol1, Roman Adam1, Bastian Heller1, Moritz Plötzing1, Christian Weier1, Claus M. Schneider1, Chan La-O-Vorakiat2, Emrah Turgut2, Henry C. Kapteyn2, Margaret M. Murnane2, Stefan Mathias3, Martin Aeschlimann3, Justin M. Shaw4, Hans Nembach4, and Thomas J. Silva4 — 1Peter Grünberg Institut, PGI-6, Research Center Jülich, 52425, Jülich, Germany — 2Department of Physics and JILA, University of Colorado, Boulder, Colorado 80309-0440, USA — 3University of Kaiserslautern and Research Center OPTIMAS, 66606, Kaiserslautern, Germany — 4Electromagnetics Division, National Institute of Standards and Technology, Boulder, Colorado, 80305-3328, USA
Using ultrafast light pulses of laser-generated high harmonics between 20 eV and 70 eV, we investigated static and dynamic properties of interlayer exchange-coupled thin Fe-Ru-Ni-trilayers with varying Ru thickness. In the static case we observed layer-selective switching of Fe- and Ni-layers. We studied the magnetization dynamics on the fs-timescale using a pump-probe technique with 1,5 eV-pump and high harmonics-probe and observed layer-selective dynamics of Fe- and Ni-layers at the M absorpion edges (54 eV for Fe and 66 eV for Ni). A comparison of the demagnetization times for parallel and antiparallel magnetization alignment of the Fe- and Ni-layers provides insight into the role of exchange interaction and spin transport in femtomagnetism.