Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Spin-Dynamics/Switching I
MA 19.4: Vortrag
Mittwoch, 28. März 2007, 16:00–16:15, H23
Eigenmode-Localization Transition in Mesoscopic Ferromagnetic Rings — •Fabian Giesen1,2,3, Jan Podbielski1, and Dirk Grundler4 — 1Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg — 2Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2J7 Canada — 3Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Straße 2 A , 12489 Berlin — 4Lehrstuhl für Experimentalphysik E10, TU München, James-Franck-Straße 1, 85747 Garching
We have investigated the dynamic eigenmode spectrum of ferromagnetic micron-sized rings in the quasi-saturated (‘onion’) state. Inductive broadband detection of spin dynamcis (vector network analyzer ferromagnetic resonance) was used to detect the spin dynamics spectrum. The ring width was varied systematically and the spectra revealed a gradual localization of eigenmodes in the regions where the internal field is at maximum and at minimum. Using micromagnetic simulations and a semi-analytical WKB approach the increasing internal field inhomogeneity can be shown to be the reason for the mode localization process. The research was funded by BMBF Spintronic 12N8283, iCore and CIAR.