Berlin 2008 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Spin Dynamics / Spin Torque I
MA 19.12: Talk
Wednesday, February 27, 2008, 17:00–17:15, EB 301
The influence of non centric holes on the magnetization dynamics of Landau structures — •Sebastian Wintz1, Karsten Kuepper1, Matthias Buess2, Joerg Raabe2, Christoph Quitmann2, Chavkat Akhmadaliev1, Lothar Bischoff1, and Juergen Fassbender1 — 1FZ Dresden-Rossendorf, Bautzner Landstr. 128, D-01328 Dresden, Germany — 2Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Magnetic vortex cores are attracted and can be trapped by artificial defects. If more than one of such defects are created a switching between different vortex core trapped states, which might serve as discrete levels in a multivalent memory device, can be achieved. Up to now a number of studies of circular vortex structures comprising holes has been reported, e. g. [1,2,3]. We report the imaging of the magnetic excitation spectrum in presence of holes, fabricated by focussed ion beam milling, in the magnetic domains and domain walls of Landau structures by means of x-ray magnetic circular dichroism photoemission electron microscopy (XMCD-PEEM). Due to the very high lateral and temporal resolution the magnetization dynamics and the corresponding Eigen modes, which are characteristic for the vortex-hole interaction, are investigated in detail. The experimental results are compared to micromagnetic simulations.
[1] M. Rahm et al., Appl. Phys. Lett. 85, 1553 (2004).
[2] T. Uhlig et al., Phys. Rev. Lett. 95, 237205 (2005).
[3] F. Hoffmann et al., Phys. Rev. B 76, 014416 (2007).