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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 9: Magnetic Imaging

MA 9.7: Talk

Monday, March 27, 2006, 16:30–16:45, HSZ 401

Element Specific Imaging of Vortex Dynamics in Ferromagnetic Multilayer Systems — •Kang Wei Chou1, Aleksandar Puzic1, Hermann Stoll1, Bartel Van Waeyenberge2, Tolek Tyliszczak3, Karsten Rott4, Günter Reiss4, Hubert Brückl5, Ingo Neudecker6, Dieter Weiss6, Christian H. Back6, and Gisela Schütz11Max-Planck-Institut für Metallforschung, Stuttgart — 2Ghent University — 3Chemical Science Division, LBNL, Berkeley — 4Universität Bielefeld — 5ARCS, Nano System Technology, Tech Gate, Vienna — 6Universität Regensburg

Magnetization dynamics in micron-sized ferromagnetic multilayer structures was studied by time-resolved scanning transmission X-ray microscopy (TR-STXM, ALS, Berkeley). The movement of the magnetic vortex in individual ferromagnetic layers and the coupling between these layers were investigated by taking advantage of the element specificity of the XMCD effect (X-ray Magnetic Circular Dichroism). Square-shaped 1 µ m × 1 µ m trilayer elements consisting of Co(20 nm)/Cu(10 nm)/Permalloy Ni80Fe20(20 nm) showed a Landau-like domain configuration in both ferromagnetic layers. A translational gyrotropic vortex motion was excited with an in-plane alternating magnetic field. By tuning the photon energy to the L3 absorption edges of Ni and Co respectively, element specific images of vortex dynamics in each ferromagnetic layer were recorded. A 180 degrees phase shift between the gyrotropic vortex motions in the Permalloy and the Co layer was observed, caused by magnetic coupling of the layers.

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