Enhanced magneto-optics and size effects in ferromagnetic nanowire arrays

We have fabricated a nanostructured material, composed of hexagonally arranged ferromagnetic nanowires, characterized and carefully analyzed its magneto-optical response. We have found that this material exhibits an enhancement of the Kerrrotation, as well as a strong dependence on the nanowire diameter, maintaining the concentration constant. Based on extensive numerical simulations, we have explored the origin of the enthancement and of the structure of the Kerrrotation. The origin is found to be fully compatible with a plamon-like structure that progagates along the ferromagnetic wires.