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

Chang, Chia Lin; Tamming, Ronnie R.; Broomhall, Thomas J.; Janusonis, Julius; Fry, Paul W.; Tobey, Raanan I.; Hayward, Thomas J.

doi:10.1103/PhysRevApplied.10.034068

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

Journal Article · Fri Sep 28 00:00:00 EDT 2018 · Physical Review Applied

DOI:https://doi.org/10.1103/PhysRevApplied.10.034068· OSTI ID:1542830

Chang, Chia Lin ^[1]; Tamming, Ronnie R. ^[1]; Broomhall, Thomas J. ^[2]; Janusonis, Julius ^[1]; Fry, Paul W. ^[2]; Tobey, Raanan I. ^[3]; Hayward, Thomas J. ^[2]

Univ. of Groningen, Groningen (The Netherlands)
Univ. of Sheffield, Sheffield (United Kingdom)
Univ. of Groningen, Groningen (The Netherlands); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001; No. 20180661ER

OSTI ID:: 1542830

Alternate ID(s):: OSTI ID: 1475070

Report Number(s):: LA-UR-18-26529; PRAHB2

Journal Information:: Physical Review Applied, Vol. 10, Issue 3; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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