Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Magnetic Imaging and Scattering Techniques
MA 24.2: Vortrag
Mittwoch, 13. März 2013, 09:45–10:00, H22
Universal correlated velocity and domain wall spin structure oscillations probed by direct dynamic imaging — •Mohamad-Assaad Mawass1,2, André Bisig2,3,4, Amelie Axt1, Martin Stärk3,4, Christoforos Moutafis3,4, Jan Rhensius3,4, Matthias Noske2, Markus Weigand2, Tolek Tyliszczak5, Bartel Van Waeyenberge6, Hermann Stoll2, Gisela Schütz2, and Mathias Kläui1,3,4 — 1Johannes Gutenberg-Universität Mainz, Germany — 2Max-Planck-Institut für Intelligente Systeme, Stuttgart, Germany — 3Paul Scherrer Institut, Villigen, Switzerland — 4Universität Konstanz, Germany — 5Advanced Light Source, LBNL, Berkeley, USA — 6Ghent University, Ghent, Belgium
Magnetic memory, sensing and logic devices based on the motion of magnetic domain walls (DWs) rely on the precise control of the position and the velocity of individual magnetic DWs. Varying DW velocities have been predicted to result from intrinsic effects, such as oscillating DW spin structure transformations and extrinsic pinning due to imperfections. We use direct dynamic imaging of the nanoscale spin structure to investigate these predictions, revealing universal oscillating domain wall motion. As the origin, the oscillating magnetostatic energy reservoir is identified, which scales with the DW velocity. Imaging wall motion in rings with varying width, we correlate the velocity with the wall energy revealing wall inertia. This inertia also explains our observation of extrinsic pinning-dominated DW propagation at low velocities, while we are able to achieve reproducible wall motion for fast walls that overcome defect-pinning.