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Title: Selective Excitation of Localized Spin-Wave Modes by Optically Pumped Surface Acoustic Waves

Abstract

We explore the feasibility of exciting localized spin-wave modes in ferromagnetic nanostructures using surface acoustic waves. The time-resolved Faraday effect is used to probe the magnetization dynamics of an array of nickel nanowires. The optical-pump pulse excites both spin-wave modes of the nanowires and acoustic modes of the substrate and we observe that, when the frequencies of these modes coincide, the amplitude of magnetization dynamics is substantially enhanced due to magnetoelastic coupling between the two. Notably, by tuning the magnitude of an externally applied magnetic field, optically excited surface acoustic waves can selectively excite either the upper or lower branches of a splitting in the nanowire’s spin-wave spectrum, which micromagnetic simulations indicate is caused by localization of spin waves in different parts of the nanowire. Furthermore, our results indicate the feasibility of using acoustic waves to selectively excite spatially confined spin waves, an approach that may find utility in future magnonic devices where coherent structural deformations could be used as coherent sources of propagating spin waves.

Authors:
 [1];  [1];  [2];  [1];  [2];  [3];  [2]
  1. Univ. of Groningen, Groningen (The Netherlands)
  2. Univ. of Sheffield, Sheffield (United Kingdom)
  3. Univ. of Groningen, Groningen (The Netherlands); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1542830
Alternate Identifier(s):
OSTI ID: 1475070
Report Number(s):
LA-UR-18-26529
Journal ID: ISSN 2331-7019; PRAHB2
Grant/Contract Number:  
89233218CNA000001; No. 20180661ER
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 10; Journal Issue: 3; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Chang, Chia Lin, Tamming, Ronnie R., Broomhall, Thomas J., Janusonis, Julius, Fry, Paul W., Tobey, Raanan I., and Hayward, Thomas J. Selective Excitation of Localized Spin-Wave Modes by Optically Pumped Surface Acoustic Waves. United States: N. p., 2018. Web. doi:10.1103/PhysRevApplied.10.034068.
Chang, Chia Lin, Tamming, Ronnie R., Broomhall, Thomas J., Janusonis, Julius, Fry, Paul W., Tobey, Raanan I., & Hayward, Thomas J. Selective Excitation of Localized Spin-Wave Modes by Optically Pumped Surface Acoustic Waves. United States. doi:10.1103/PhysRevApplied.10.034068.
Chang, Chia Lin, Tamming, Ronnie R., Broomhall, Thomas J., Janusonis, Julius, Fry, Paul W., Tobey, Raanan I., and Hayward, Thomas J. Fri . "Selective Excitation of Localized Spin-Wave Modes by Optically Pumped Surface Acoustic Waves". United States. doi:10.1103/PhysRevApplied.10.034068. https://www.osti.gov/servlets/purl/1542830.
@article{osti_1542830,
title = {Selective Excitation of Localized Spin-Wave Modes by Optically Pumped Surface Acoustic Waves},
author = {Chang, Chia Lin and Tamming, Ronnie R. and Broomhall, Thomas J. and Janusonis, Julius and Fry, Paul W. and Tobey, Raanan I. and Hayward, Thomas J.},
abstractNote = {We explore the feasibility of exciting localized spin-wave modes in ferromagnetic nanostructures using surface acoustic waves. The time-resolved Faraday effect is used to probe the magnetization dynamics of an array of nickel nanowires. The optical-pump pulse excites both spin-wave modes of the nanowires and acoustic modes of the substrate and we observe that, when the frequencies of these modes coincide, the amplitude of magnetization dynamics is substantially enhanced due to magnetoelastic coupling between the two. Notably, by tuning the magnitude of an externally applied magnetic field, optically excited surface acoustic waves can selectively excite either the upper or lower branches of a splitting in the nanowire’s spin-wave spectrum, which micromagnetic simulations indicate is caused by localization of spin waves in different parts of the nanowire. Furthermore, our results indicate the feasibility of using acoustic waves to selectively excite spatially confined spin waves, an approach that may find utility in future magnonic devices where coherent structural deformations could be used as coherent sources of propagating spin waves.},
doi = {10.1103/PhysRevApplied.10.034068},
journal = {Physical Review Applied},
number = 3,
volume = 10,
place = {United States},
year = {2018},
month = {9}
}

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