Enhanced Magneto-Optical Edge Excitation in Nanoscale Magnetic Disks
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AuthorBerger, A.; Alcaraz de la Osa, Rodrigo; Suszka, A. K.; Pancaldi, M.; Saiz Vega, José María; Moreno Gracia, Fernando; Oepen, H. P.; Vavassori, P.
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 ¼ 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.