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

College of Electrical Engineering and Computer Science

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

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

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4772798

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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",

month = dec,

day = "17",

doi = "10.1063/1.4772798",

language = "English",

volume = "101",

journal = "Applied Physics Letters",

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publisher = "American Institute of Physics Publising LLC",

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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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DO - 10.1063/1.4772798

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JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 25

M1 - 252409

ER -

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

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