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We report on the nuclear resonance scattering (25.651 keV resonant transition) of synchrotron radiation (SR) for [Dy(60Å)/Gd(60Å)]30 multilayer. The quantum beats in the reflectivity time spectrum and the decay speed allow us to obtain the magnetic hyperfine field and the relaxation time dependence in the 4 - 110 K temperature range. The determined hyperfine magnetic field Bhf in the Dy layers decreases from 570 T at 4 K to 460 T at 110 K with the corresponding change of the relaxation time from ~200 ns to ~16 ns.