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Published on: July 20, 2022
Enhanced Magneto-Optical Edge Excitation in Nanoscale Magnetic Disks
A Berger1, R Alcaraz de la Osa2, A K Suszka1
1CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain.
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.
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