Abstract

When biased with an external magnetic field, time reversal symmetry in the material response of ceramic YIG ferrites is broken along the bias direction which alters the dispersion of electromagnetic (EM) waves propagating within. When the propagation direction is along an axis perpendicular to the bias, the EM field can be decomposed into transverse electric (TE) and transverse magnetic modes where transverse is defined with respect to the propagation direction. Of particular interest are the TE modes, for which a band gap is opened in the dispersion over a frequency range where the effective permeability seen by the mode is negative. Similar to Surface Plasmon Polaritons guided by the surface of materials having a negative effective permittivity along the propagation direction, surface magnon polaritons (SMPs) are guided by the surface of materials having an effective negative permeability. The existence of a uni-directional SMP in the TE band gap of a biased ferrite has been known for some time now. However, more recently the connection to momentum space topology has been made for electromagnetic continua, giving a much deeper insight into its unique properties.

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