Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Micro- and Nanostructured Materials
MA 4.9: Talk
Monday, March 16, 2015, 11:45–12:00, H 1012
Domain wall dynamics in asymmetric ferromagnetic rings — •Kornel Richter1, Mohammad-A. Mawass1, Andrea Krone1, Benjamin Kruger1, Markus Weigand2, Hermann Stoll2, Gisela Schutz2, and Mathias Klaeui1 — 1Johannes Gutenberg Universität-Mainz, Institut of Physics, Staudinger Weg 7, 55128 Mainz, Germany — 2Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, Stuttgart 70569, Germany
Domain wall (DW) propagation in ferromagnetic nanorings is characterized by a non-constant DW velocity even if it is driven by rotating field of constant amplitude and frequency. Here, we examine ferromagnetic rings, in which the domain wall velocity can be additionally controlled on a local scale using variations of DW potential landscape that has been introduced to the sample via geometrical variations, such as a non-constant ring-width. Time-resolved observations of domain wall motion in asymmetric rings reveal that the phase shift between the direction of magnetic field and domain wall position is strongly related to the asymmetric shape of the sample, namely, the varying ring width. Such relative change of the phase shift result in variations of DW velocity profile, thus allowing one to control the DW velocity locally. In addition, the asymmetric shape of the sample give rise to the presence of DW motion that occurs even without the presence of external magnetic field (i.e. automotion). Such effects can be understood in terms of the minimization of the total energy.