Magneto-Impedance measurements in thin films of the Spin-Glass Cu100-xMnxAu13.5 (x = 6.75 and 13.5) alloys

•Magneto-impedance was measured in samples of Cu100-xMnxAu13.5 (x = 6.75 and 13.5).•Non-vanishing values for the magneto-impedance data were obtained for all values of T.•The transverse magnetic susceptibility showed a minimum near the freezing temperature.•The dynamics of the spin-glass phase was investigated in a short-time scale.•A model for the relaxation-time based on the critical slowing down was presented.