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

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 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

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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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.",

author = "Birt, \{Daniel R.\} and Kyongmo An and Maxim Tsoi and Shingo Tamaru and David Ricketts and Wong, \{Kin L.\} and \{Khalili Amiri\}, Pedram and Wang, \{Kang L.\} and Xiaoqin Li",

note = "Funding Information: 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).",

year = "2012",

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doi = "10.1063/1.4772798",

language = "English (US)",

volume = "101",

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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

N1 - Funding Information: 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).

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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JO - Applied Physics Letters

JF - Applied Physics Letters

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M1 - 252409

ER -

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

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