Abstract
The AFMR spectra of the NdFe 3(BO 3) 4 crystal are measured in a wide range of frequencies and temperatures. It is found that by the type of its magnetic anisotropy the compound is an “easy-plane” antiferromagnet with a weak anisotropy in the basal plane. The effective magnetic parameters are determined: anisotropy fields H a1 =1.14 kOe and H a2 =60 kOe and magnetic excitation gaps Δ ν 1 =101.9 GHz and Δ ν 2 =23.8 GHz. It is shown that commensurate–incommensurate phase transition causes a shift in resonance field and a considerable change in absorption line width. At temperatures below 4.2 K nonlinear regimes of AFMR excitation at low microwave power levels are observed.
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