Exchange-coupling modified spin wave spectra in the perpendicularly magnetized Permalloy nanodot chain arrays

Jian Dou, Sarah C. Hernandez, Chengtao yu, Michael J. Pechan, Liesl Folks, Jordan A. Katine, Matthew J. Carey

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Spin wave spectra in exchange-coupled nanoscale dot chain arrays were studied using ferromagnetic resonance. The dot chain arrays, with dot diameters of 300 nm and thicknesses of 40 nm, coupled via Permalloy bridges of width ranging from 0 (no bridge) to 60 nm, were fabricated using e-beam lithography. In the perpendicularly magnetized isolated dots, multiple sharp ferromagnetic resonant peaks were observed, which are associated with the quantized in-plane wave vector due to the finite dot radius. These spectrum lines shift to higher fields for samples with wider bridges due to the increasing effective demagnetizing factor. For coupled dots, additional satellite peaks were observed at both sides of higher order spin wave modes and at the lower field side of the uniform mode. We show that these satellite peaks can be attributed to the excitation in each bridged dot and the interdot exchange coupling, respectively.

Original languageEnglish (US)
Pages (from-to)1519, 200
JournalJournal of Applied Physics
Volume107
Issue number9
DOIs
StatePublished - May 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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