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Magneto-Optical Response of Cobalt Interacting with Plasmonic Nanoparticle Superlattices
journal contribution
posted on 2016-11-10, 14:40 authored by Michael B. Ross, Marc R. Bourgeois, Chad A. Mirkin, George C. SchatzThe magneto-optical Kerr effect is
a striking phenomenon whereby
the optical properties of a material change under an applied magnetic
field. Though promising for sensing and data storage technology, these
properties are typically weak in magnitude and are inherently limited
by the bulk properties of the active magnetic material. In this work,
we theoretically demonstrate that plasmonic thin-film assemblies on
a cobalt substrate can achieve tunable transverse magneto-optical
(TMOKE) responses throughout the visible and near-infrared (300–900
nm). In addition to exhibiting wide spectral tunability, this response
can be varied in sign and magnitude by changing the plasmonic volume
fraction (1–20%), the composition and arrangement of the assembly,
and the shape of the nanoparticle inclusions. Of particular interest
is the newly discovered sensitivity of the sign and intensity of the
TMOKE spectrum to collective metallic plasmonic behavior in silver,
mixed silver–gold, and anisotropic superlattices.
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magneto-optical Kerr effectdata storage technologycobalt substratebulk propertiesplasmonic behaviorCobalt Interactinganisotropic superlatticesassemblyPlasmonic Nanoparticle SuperlatticesTMOKE spectrumnanoparticle inclusionsMagneto-Optical Responseplasmonic thin-film assembliesmagnitudematerial changeresponse
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