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.
Highlights
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 1⁄4 100 nm samples
In conjunction with magnetoplasmonics, such effects could lead to novel functionalities for the manipulation of light at the nanoscale, which are expected to play a major role in the emerging technology of flat optics [28,29]
Summary
Enhanced Magneto-Optical Edge Excitation in Nanoscale Magnetic Disks We report unexpected enhancements of the magneto-optical effect in ferromagnetic Permalloy disks of diameter D < 400 nm.
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