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Tuning the Magneto-Optical Response of Nanosize Ferromagnetic Ni Disks Using the Phase of Localized Plasmons

Journal article
Authors N. Maccaferri
A. Berger
S. Bonetti
V. Bonanni
M. Kataja
Q. H. Qin
S. van Dijken
Zhaleh Pirzadeh
Alexandre Dmitriev
J. Nogues
Johan Åkerman
P. Vavassori
Published in Physical Review Letters
Volume 111
Issue 16
Pages artikel nr 167401
ISSN 0031-9007
Publication year 2013
Published at Department of Physics (GU)
Pages artikel nr 167401
Language en
Links dx.doi.org/10.1103/PhysRevLett.111....
https://gup.ub.gu.se/file/146610
Keywords FARADAY-ROTATION, ENHANCED MAGNETOOPTICS, OPTICAL-PROPERTIES, KERR, ROTATION, FILMS, MAGNETOPLASMONICS, ELLIPSOMETRY, PARTICLES, RESONANCE, NICKEL, IU KW
Subject categories Physical Sciences

Abstract

We explore the influence of the phase of localized plasmon resonances on the magneto-optical activity of nanoferromagnets. We demonstrate that these systems can be described as two orthogonal damped oscillators coupled by the spin-orbit interaction. We prove that only the spin-orbit induced transverse plasmon plays an active role on the magneto-optical properties by controlling the relative amplitude and phase lag between the two oscillators. Our theoretical predictions are fully confirmed by magneto-optical Kerr effect and optical extinction measurements in nanostructures of different size and shape.

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