Abstract
Various resonance modes were observed in the transmission spectra of rare-earth iron borates RFe3(BO3)4 (R = Nd3+, Sm3+, Gd3+) at the frequency range 100-600 GHz, which were attributed to collective magnetic excitations in the exchange coupled Fe-and R-subsystems, i.e. antiferromagnetic (Fe) resonance and electron transitions in the R-ions. Strong interaction of the Fe and R oscillations was revealed and theoretically analyzed taking into account feature of the R-ion ground state. Intensities of the coupled modes (contributions to magnetic permeability) strongly depend on a difference of Fe and R ions g-factors that allows defining the sign of the latter. In particular, an appreciable intensity of exchange (Nd) modes in NdFe3(BO3)4 is caused by gNd,|| < 0 whereas in GdFe3(BO3)4 with gGd gFe 2 the exchange (Gd) modes were hided due to compensation of Fe and Gd contributions. In SmFe3(BO3)4, despite a negligible Sm g-factor, the Sm modes were clear observed due to their excitation via coupling with the Fe-subsystem.
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