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 Schütz¹ — ¹Max-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.