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Magnetic and electric dipol active magnons Fe2SiO4 and Co2SiO4

We have studied the magnetic excitations of Fe2SiO4 and Co2SiO4 by means of Fourierspectroscopy in the far infrared and in an external magnetic field. For the analysis of our experimental data we have introduced a spin wave model and have determined the values of the parameters, exchange interactions and anisotropy constants.