Abstract
We report on the transport and magnetic properties of Co x Cu 1− x metallic granular system, with 0.2< x<0.25. These samples have been prepared by ion beam sputtering at room temperature on glass substrate. Giant magnetoresistance (GMR) has been observed for all the concentrations studied with an average amplitude around 2% for the as-deposited samples at 300 K. The maximum value has been observed for the Co 21Cu 79 granular alloy. Above this Co concentration the MR decreases which is attributed to the start of the percolation mechanism. The annealing of Co 21Cu 79 granular alloy at 450°C leads to a strong increase of the MR to reach 16% after 2 h annealing. The variation of magnetic and transports properties with the Co concentration and annealing time is discussed.
Published Version
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