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Polarizability and magnetoplasmonic properties of magnetic general nanoellipsoids

Journal article
Authors N. Maccaferri
J. B. Gonzalez-Diaz
S. Bonetti
A. Berger
M. Kataja
S. van Dijken
J. Nogues
Valentina Bonanni
Zhaleh Pirzadeh
Alexandre Dmitriev
Johan Åkerman
P. Vavassori
Published in Optics Express
Volume 21
Issue 8
Pages 9875-9889
ISSN 1094-4087
Publication year 2013
Published at
Pages 9875-9889
Language en
Keywords optical-properties, magnetooptical activity, dynamic depolarization, metal nanoparticles, light-scattering, faraday-rotation, nanowire, arrays, enhanced fields, surface, particles
Subject categories Optics


An approach to compute the polarizability tensor of magnetic nanoparticles having general ellipsoidal shape is presented. We find a surprisingly excellent quantitative agreement between calculated and experimental magneto-optical spectra measured in the polar Kerr configuration from nickel nanodisks of large size (exceeding 100 nm) with circular and elliptical shape. In spite of its approximations and simplicity, the formalism presented here captures the essential physics of the interplay between magneto-optical activity and the plasmonic resonance of the individual particle. The results highlight the key role of the dynamic depolarization effects to account for the magneto-optical properties of plasmonic nanostructures.

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