Excitations with negative dispersion in a spin vortex

M. Buess, T. P.J. Knowles, R. Höllinger, T. Haug, U. Krey, D. Weiss, D. Pescia, M. R. Scheinfein, C. H. Back

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

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 circular nodes increases with the number of nodes. In contrast, the frequency of the modes with diametric nodes decreases with the number of nodes. This behavior is explained accurately by an analytical model.

Original languageEnglish
Article number104415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number10
DOIs
StatePublished - 1 Mar 2005
Externally publishedYes

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