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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 9 — Sep. 1, 2012
  • pp: 1260–1269

Brillouin light scattering by spin waves in magnetic metamaterials based on Co nanorods

Y. Veniaminova, A. A. Stashkevich, Y. Roussigné, S. M. Chérif, T. V. Murzina, A. P. Murphy, R. Atkinson, R. J. Pollard, and A. V. Zayats  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 9, pp. 1260-1269 (2012)
http://dx.doi.org/10.1364/OME.2.001260


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Abstract

We report on the investigations of spin wave modes in arrays of densely packed Co nanorods using Brillouin light scattering. We have observed a significant role 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 the 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 metamaterials are important class of active metamaterials needed for prospective data storage and signal processing applications.

© 2012 OSA

OCIS Codes
(300.6330) Spectroscopy : Spectroscopy, inelastic scattering including Raman
(310.6860) Thin films : Thin films, optical properties
(160.3918) Materials : Metamaterials
(160.4236) Materials : Nanomaterials

ToC Category:
Metamaterials

History
Original Manuscript: June 19, 2012
Revised Manuscript: August 6, 2012
Manuscript Accepted: August 8, 2012
Published: August 15, 2012

Citation
Y. Veniaminova, A. A. Stashkevich, Y. Roussigné, S. M. Chérif, T. V. Murzina, A. P. Murphy, R. Atkinson, R. J. Pollard, and A. V. Zayats, "Brillouin light scattering by spin waves in magnetic metamaterials based on Co nanorods," Opt. Mater. Express 2, 1260-1269 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-9-1260


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