Polarizability and magnetoplasmonic properties of magnetic general nanoellipsoids
Journal article, 2013

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.


metal nanoparticles


enhanced fields


dynamic depolarization





magnetooptical activity


N. Maccaferri

Nanomagnetism Group

J. B. Gonzalez-Diaz

Nanomagnetism Group

Stefano Bonetti

Stanford University

A. Berger

Nanomagnetism Group

M. Kataja

Aalto University

S. van Dijken

Aalto University

Josep Nogues

Institut Catala de Nanociencia i Nanotecnologia

Valentina Bonanni

Consiglo Nazionale Delle Richerche

Zhaleh Pirzadeh Irannezhad

Chalmers, Applied Physics, Bionanophotonics

Alexander Dmitriev

Chalmers, Applied Physics, Bionanophotonics

Johan Åkerman

Royal Institute of Technology (KTH)

Paolo Vavassori

Nanomagnetism Group

Basque Foundation for Science (Ikerbasque)

Optics Express

1094-4087 (ISSN) 10944087 (eISSN)

Vol. 21 8 9875-9889

Subject Categories

Atom and Molecular Physics and Optics



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