Brillouin scattering of light by spin waves in ferromagnetic nanorods

We report the investigations of spin wave modes of arrays of Ni and Co nanorods using Brillouin light scattering. We have revealed the significant influence of spin wave modes along the nanorod axis in contrast to infinite magnetic nanowires. Unusual optical properties featuring an inverted Stokes/a...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2012-10, Vol.324 (21), p.3406-3409
Main Authors: Stashkevich, A.A., Roussigné, Y., Djemia, P., Yushkevich, Y., Chérif, S.M., Evans, P.R., Murphy, A.P., Hendren, W.R., Atkinson, R., Pollard, R.J., Zayats, A.V.
Format: Article
Language:English
Subjects:
Arrays
Brillouin spectroscopy
Brillouin zone
Low aspect ratio
Metamaterials
Nanorods
Nanostructure
Nanowires
Scattering
Spin waves
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Summary:We report the investigations of spin wave modes of arrays of Ni and Co nanorods using Brillouin light scattering. We have revealed the significant influence of spin wave modes along the nanorod axis in contrast to infinite magnetic nanowires. Unusual optical properties featuring an inverted Stokes/anti-Stokes asymmetry of the Brillouin scattering spectra have been observed. The spectrum of spin wave modes in the nanorod array has been calculated and compared with the experiment. Experimental observations are explained in terms of a combined numerical–analytical approach taking into account both the low aspect ratio of individual magnetic nanorods and dipolar magnetic coupling between the nanorods in the array. The optical studies of spin-wave modes in nanorod metamaterials with low aspect ratio nanorods have revealed new magnetic and magneto-optical properties compared to continuous magnetic films or infinite magnetic nanowires. Such magnetic artificial materials are important class of active metamaterials needed for prospective data storage and signal processing applications.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2012.02.053