Magnetic and elastic effects in rapidly solidified Cu(100-x)Co(x) alloys

The Co precipitation in the Cu(100-x)Co(x) (x less than or equal to 12) granular system obtained by rapid solidification has been investigated by acoustical spectroscopy and magnetic measurements. Particular attention was given in the preparation of samples and annealing procedure in order to identify the optimum structural conditions for the observation of high magnetoresistance at room temperature. The magnetisation curves of the superparamagnetic samples are related to the distribution of Go-rich particles and the elastic energy dissipation coefficient vs, temperature is strongly affected by the microstructure resulting from different Co concentration and thermal treatments. So we obtained information about the distribution of Co both in the as-quenched and annealed samples