Abstract
Magnetic resonance studies of the low-dimensional monoclinic compound NaFe(WO4)2 are carried out in the frequency range 25–142 GHz and temperature range 1.8–300 K. The EPR data near the phase transition attest to the two-dimensionality of the magnetic structure of NaFe(WO4)2. The frequency-field relation of the AFMR spectrum shows that this compound is a biaxial antiferromagnet. The characteristic parameters of the AFMR energy spectrum are determined: the values of the energy gaps ν1=141 GHz and ν2=168.7 GHz, the anisotropy fields Ha1=10.5 kOe and Ha2=15 kOe, and the exchange field He=121 kOe. The ratio of the intralayer to the interlayer exchange is estimated. Additional absorption is observed due to local modes caused by destruction of the translational order of the magnetic structure.
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