The authors introduce a general mechanism, based on electrostatic and magnetostatic considerations, for designing three-dimensional isotropic metamaterials that possess an enhanced refractive index over an extremely large frequency range. The mechanism allows nearly independent control of effective electric permittivity and magnetic permeability without the use of resonant elements.

The ability of magnetic nanoparticles (MNPs) to transform electromagnetic energy into heat is widely exploited in well-known thermal cancer therapies, such as hyperthermia, which proves useful enhancing the radio- and chemo-sensitivity human tumor cells. Since release ruled by complex behavior MNPs, a careful investigation needed understand role their intrinsic (composition, size shape) collect...