Topology optimization of an electromagnetic cloak using a ferrite material

This paper numerically demonstrates that a systematic design approach based on topology optimization can be applied to find the layout of a ferrite material that functions as an electromagnetic cloak with a relatively small cloaking region. The numerical results indi- cate that the frequency-dependent aspect of a ferrite material's permeability may enable cloak designs with novel functions, such as on-off operation in response to on-off application of an external magnetic field.