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Enhanced Magneto-Optical Edge Excitation in Nanoscale Magnetic Disks

A. Berger, R. Alcaraz de la Osa, A. K. Suszka, M. Pancaldi, J. M. Saiz, F. Moreno, H. P. Oepen, and P. Vavassori
Phys. Rev. Lett. 115, 187403 – Published 30 October 2015
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Abstract

We report unexpected enhancements of the magneto-optical effect in ferromagnetic Permalloy disks of diameter D<400nm. The effect becomes increasingly pronounced for smaller D, reaching more than a 100% enhancement for D=100nm samples. By means of experiments and simulations, the origin of this effect is identified as a nanoscale ring-shaped region at the disk edges, in which the magneto-optically induced electric polarization is enhanced. This leads to a modification of the electromagnetic near fields and causes the enhanced magneto-optical excitation, independent from any optical resonance.

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  • Received 30 October 2014

DOI:https://doi.org/10.1103/PhysRevLett.115.187403

© 2015 American Physical Society

Authors & Affiliations

A. Berger1, R. Alcaraz de la Osa2, A. K. Suszka1,*, M. Pancaldi1, J. M. Saiz2, F. Moreno2, H. P. Oepen3, and P. Vavassori1,4

  • 1CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain
  • 2Grupo de Óptica. Departamento de Física Aplicada. Universidad de Cantabria, Avenida de los Castros s/n, Santander, Spain
  • 3Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany
  • 4IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain

  • *Present address: Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland, Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.

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Issue

Vol. 115, Iss. 18 — 30 October 2015

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