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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 26 — Sep. 10, 2010
  • pp: 5013–5019

Enhancement of magneto-optical effects in magnetic nanoparticles near gold-dielectric surfaces

Vasyl G. Kravets and Anatoliy S. Lapchuk  »View Author Affiliations

Applied Optics, Vol. 49, Issue 26, pp. 5013-5019 (2010)

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We report enhanced magneto-optical Kerr rotation in the layer systems of a magnetic granular film coated by uniform gold and dielectric films. The Kerr rotation spectra measured from 1.2 to 5 eV show a peak at about 2.7 eV , not present in either uncoated magnetic particle films. It was shown that the polar magneto-optical Kerr signal is about five times higher than that obtained for CoFe-MgO granular films in similar conditions. The physical nature of the magneto-optical effect enhancement in three layers (magnetic/noble/dielectric films) is related to the excitation of surface plasmons and their fast propagation on the interface of a complex three-layer structure. The Kerr rotation enhancement corresponds to intrinsic electronic transitions in the CoFe nanogranules due to the spectral overlap of these transitions with propagating surface plasmons.

© 2010 Optical Society of America

OCIS Codes
(160.3820) Materials : Magneto-optical materials
(240.6680) Optics at surfaces : Surface plasmons
(310.6860) Thin films : Thin films, optical properties
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

Original Manuscript: June 22, 2010
Manuscript Accepted: July 9, 2010
Published: September 9, 2010

Vasyl G. Kravets and Anatoliy S. Lapchuk, "Enhancement of magneto-optical effects in magnetic nanoparticles near gold-dielectric surfaces," Appl. Opt. 49, 5013-5019 (2010)

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