This talk is dedicated to metamaterials based on naturally magnetic nano-elements. The concept will be illustrated by two major geometries, namely single films comprised of arrays of ferromagnetic nano-wires of transition metals (Co, Ni) and multi-layer Ni inverse opal structures. The main experimental tool being Brillouin (BLS –Brillouin Light Scattering) spectroscopy, the discussion will include microwave magnetic, magneto-optic and purely optic properties of the above mentioned structures.
The seminar is also intended as an invitation to a discussion concerning the promising possibility of combining the advantages of ”meta-atoms” made of naturally ferromagnetic materials (naturally hyperbolic media) and the properties due to their spatial configuration allowing realization of novel artificial magnetic and dielectric properties (in the spirit of Veselago-Pendry metamaterials).