Abstract
We report unexpected enhancements of the magneto-optical effect in ferromagnetic Permalloy disks of diameter . The effect becomes increasingly pronounced for smaller , reaching more than a 100% enhancement for 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.
- Received 30 October 2014
DOI:https://doi.org/10.1103/PhysRevLett.115.187403
© 2015 American Physical Society