Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Magnetization / Demagnetization Dynamics II
MA 23.11: Vortrag
Mittwoch, 28. März 2012, 12:30–12:45, H 1012
Quasi uniform modes and standing spinwaves in a single Co-Stripe measured by Ferromagnetic Resonance — •Christian Schöppner1, Sven Stienen1, Ryszard Narkowicz2, Dieter Suter2, Ralf Meckenstock1, Jürgen Lindner1, and Michael Farle1 — 1University of Duisburg-Essen, CeNIDE, Faculty for Physics, Lotharstr. 1 47057 Duisburg — 2Technical University Dortmund, Faculty für Physik, Otto-Hahn-Str. 4 44227 Dortmund
Stripe-like magnetic systems of a few micrometer lateral size and few nanometer thickness exhibit quasi-uniform excitations which are influenced by dynamic pinning, modes of standing character and those which are characterized by a pronounced local confinement due to the inhomogeneous demagnetization field. As the sample edges and inhomogeneities in the demagnetization field become important in such systems, it is crucial to rather measure single stripe samples than ensembles. We present results of Ferromagnetic Resonance experiments on one single Co-Stripe of a few micrometer lateral size and 20nm thickness. For the first time measurements were performed using a microresonator [Banholzer et al. Nanotech. 22 (2011)] in an angular dependent way. The angular dependence was conducted over 180 degree with respect to the long axis of the stripe. We used microwave-frequency of 14GHz and external magnetic fields up to 300mT at room temperature. The measured spectra exhibit the mentioned types of spin waves and are in very good agreement with micro magnetic simulations, which will also be discussed. The work is funded by the DFG (LI 1567/3-1)