Deviation from exponential decay for spin waves excited with a coplanar waveguide antenna

Daniel R. Birt, Kyongmo An, Maxim Tsoi, Shingo Tamaru, David Ricketts, Kin L. Wong, Pedram Khalili Amiri, Kang L. Wang, Xiaoqin Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We have investigated the propagation of surface spin waves in a Permalloy thin film excited by an asymmetric coplanar antenna. A surprising oscillatory behavior superimposed on the exponential decay is observed in the spin wave intensity mapped with the micro-Brillouin light scattering technique. The oscillations can be modeled as the interference between a propagating spin wave and a background magnetization with spatially uniform phase. We use a simple closed-form equation that includes both contributions to fit our experimental results. From the fit results, we extract the spin wave propagation length and the spin wave vector in a frequency range limited by the antenna bandwidth.

Original languageEnglish (US)
Article number252409
JournalApplied Physics Letters
Volume101
Issue number25
DOIs
StatePublished - Dec 17 2012

Funding

We gratefully acknowledge financial support from the following sources: AFOSR FA9550-08-1-0463, AFOSR FA-9550-08-1-0058, and the Alfred P. Sloan Foundation. D.B. acknowledges a fellowship from the NSF-IGERT program via Grant No. DGE-0549417. M.T. is supported in part by NSF Grant DMR 1207577. The work at UCLA was supported by the DARPA program on Non-Volatile Logic, and by the Nanoelectronics Research Initiative (NRI) through the Western Institute of Nanoelectronics (WIN).

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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