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Magnetically induced topological transitions of isofrequency surfaces of bulkwaves propagating through an unbounded biaxial gyrotropic medium are studied.The medium is constructed from a two-component superlattice composed ofmagnetized ferrite and semiconductor layers. To derive the constitutiveparameters of the gyrotropic medium, a homogenization procedure from theeffective medium theory is applied. The study is carried out in the frequencyrange near the frequency of ferromagnetic resonance, where the magneticsubsystem possesses the properties of natural hyperbolic dispersion. Thetopological transitions from an open type-I hyperboloid to several intricatehyperbolic-like forms are demonstrated for the extraordinary waves. We revealhow realistic material losses change the form of isofrequency surfacecharacterizing hyperbolic dispersion. The obtained results broaden ourknowledge on the possible topologies of isofrequency surfaces that can appearin gyrotropic media influenced by an external static magnetic field.

Magnetically induced topological transitions of hyperbolic dispersion in biaxial gyrotropic media