Towards high-frequency negative permeability using magnonic crystals in metamaterial design.

We investigate the magnonic properties of thin slabs of one-dimensional magnonic crystals with the aim of obtaining a structure that possesses negative permeability at high frequencies. Metamaterials of this kind could be used within devices based on the negative refractive index phenomenon. We calculate the relative excitation strengths of different spin-wave modes in one-dimensional magnonic crystals. We find that the coupling between light and high-order magnonic modes can be significant for the specific design of the magnonic structure. These results suggest that magnonic crystals are therefore promising candidates for the negative refractive index metamaterials. [ABSTRACT FROM AUTHOR]