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

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

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
Article number252409
JournalApplied Physics Letters
Volume101
Issue number25
DOIs
Publication statusPublished - 2012 Dec 17

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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