Mode degeneracy due to vortex core removal in magnetic disks

URN to cite this document:: urn:nbn:de:bvb:355-epub-79206

Hoffmann, Frank ; Woltersdorf, Georg ; Perzlmaier, Korbinian ; Slavin, A ; Tiberkevich, V ; Bischof, A ; Weiss, Dieter ; Back, Christian

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Date of publication of this fulltext: 05 Aug 2009 13:57

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Abstract

The mode spectrum of micrometer-sized ferromagnetic Permalloy disks, exhibiting a vortex ground state, is investigated by means of time-resolved scanning Kerr microscopy. The temporal evolution of the magnetization is probed after application of a fast in-plane field pulse. The lowest order azimuthal mode, a mode with only one diametric node, splits into a doublet as the disk diameter ...