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The magnetic properties of amorphous Co[Formula: see text]Zrx films prepared by co-evaporation have been studied by means of vibrating sample magnetometry and ferromagnetic resonance. The temperature dependence of spontaneous magnetization [Formula: see text] in the low temperature range can be described using Bloch’s law. In addition, the spin wave stiffness constant, the distance between nearest magnetic atoms and the exchange interaction between cobalt and its nearest neighbors were calculated from the experimental results for [Formula: see text]. Spin-wave resonance modes were obtained and the change of the resonant field as a function of the mode number [Formula: see text] obeys the so-called [Formula: see text] law perpendicular to the film plane at 300[Formula: see text]K.