Abstract
When microwaves travel in a waveguide along a structure formed from a ferrite plate and a lattice of resonant elements, nonreciprocal effects are observed at the lattice frequencies after application of a magnetostatic field whose intensity is by order of magnitude lower than the field intensity required for excitation of the ferromagnetic resonance at these frequencies. Nonreciprocal transmission and nonreciprocal splitting of the resonance curve with broadening of the resonance band under the conditions of a strong coupling between the ferrite and the lattice elements are observed. The change of the nonreciprocity sign after shifting the ferrite to the other side of the lattice and after reaching the magnetic-field intensity at which the difference between the frequency of the ferromagnetic resonance and the lattice frequency changes its sign is observed. It is theoretically shown that microwaves in a waveguide with a bianisotropic layer modeling a lattice have elliptic (circular) polarization of the magnetic field with frequency- and space-dependent direction of rotation, which is seen from the features of the nonreciprocal effects observed in experiments.
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