Abstract
In submillimeter transmission spectra of Ho 3Fe 5O 12 resonance modes originating from single-ion electron transitions inside of Ho 3+ ions and collective excitations (ferromagnetic (FMR) resonance) were observed. Temperature dependencies of their resonance frequencies, line widths and mode contributions to a static magnetic permeability have been obtained. A significant increase of the FMR frequency at low temperatures being comparable with some Ho-modes results in a strong coupling of oscillations in the Ho- and Fe-subsystems.
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