Multiple ferromagnetic resonance in mesoscopic permalloy rings

F. Giesen, J. Podbielski, T. Korn, D. Grundler

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34 Scopus citations


Using a broadband microwave spectrometer we have investigated the magnetization dynamics of mesoscopic ferromagnetic disks and rings in the frequency range from 45 MHz to 20 GHz. We studied permalloy rings with an outer diameter of 2 μm and different ring widths w. In the mesoscopic devices we find several ferromagnetic resonance (FMR) lines which shift with the in-plane magnetic field Hb. Among them, two pronounced FMR modes are identified. We attribute these modes to localized spin waves in different ring segments where the characteristic resonance frequency either decreases or increases as a function of w, depending on the orientation of the ring segment with respect to Hb.

Original languageEnglish
Article number10A712
JournalJournal of Applied Physics
Issue number10
StatePublished - 15 May 2005
Externally publishedYes


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