title: Enhanced Magneto-Optical Edge Excitation in Nanoscale Magnetic Disks.
abstract: We report unexpected enhancements of the magneto-optical effect in ferromagnetic Permalloy disks of diameter D<400 nm. The effect becomes increasingly pronounced for smaller D, reaching more than a 100% enhancement for D=100 nm 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.
authors.affiliation: CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Berger
authors.affiliation: Grupo de Óptica. Departamento de Física Aplicada. Universidad de Cantabria, Avenida de los Castros s/n, Santander, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Alcaraz de la Osa
authors.affiliation: CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain.
authors.forename: A K
authors.initials: AK
authors.lastname: Suszka
authors.affiliation: CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Pancaldi
authors.affiliation: Grupo de Óptica. Departamento de Física Aplicada. Universidad de Cantabria, Avenida de los Castros s/n, Santander, Spain.
authors.forename: J M
authors.initials: JM
authors.lastname: Saiz
authors.affiliation: Grupo de Óptica. Departamento de Física Aplicada. Universidad de Cantabria, Avenida de los Castros s/n, Santander, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Moreno
authors.affiliation: Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany.
authors.forename: H P
authors.initials: HP
authors.lastname: Oepen
authors.affiliation: CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain.|IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Vavassori