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Excitations with negative dispersion in a spin vortex

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Buess, Matthias ; Knowles, T. ; Höllinger, Rainer ; Haug, Thomas ; Krey, Uwe ; Weiss, Dieter ; Pescia, D. ; Scheinfein, M. ; Back, Christian
Date of publication of this fulltext: 05 Aug 2009 13:34


Micron-sized ferromagnetic permalloy disks having an in-plane vortexlike configuration are excited by a fast-rise-time magnetic-field pulse perpendicular to the plane. The excited modes are imaged using time-resolved magneto-optic Kerr microscopy and Fourier transformation. Two types of modes are observed: modes with circular nodes and modes with diametric nodes. The frequency of the modes with ...


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