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

doi:10.1063/1.4772798

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

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

5 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 language	English (US)
Article number	252409
Journal	Applied Physics Letters
Volume	101
Issue number	25
DOIs	https://doi.org/10.1063/1.4772798
State	Published - Dec 17 2012

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Deviation from exponential decay for spin waves excited with a coplanar waveguide antenna",

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.",

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T1 - Deviation from exponential decay for spin waves excited with a coplanar waveguide antenna

AU - Birt, Daniel R.

AU - An, Kyongmo

AU - Tsoi, Maxim

AU - Tamaru, Shingo

AU - Ricketts, David

AU - Wong, Kin L.

AU - Khalili Amiri, Pedram

AU - Wang, Kang L.

AU - Li, Xiaoqin

PY - 2012/12/17

Y1 - 2012/12/17

N2 - 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.

AB - 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.

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