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Due to the large heat of mixing in the Cu-Co system, liquid phase separation is inevitable in Cu 70 Co 30 ribbons during the course of the quenching process. The resulting large Co-rich particles exhibit either elongated or roughly spherical morphology with a distinct Cu-rich shell. The large Co-rich particles are about 100–300 nm and the shell is about 15–40 nm wide. On annealing,...
A maximum giant magnetoresistance (GMR) value of 22% has been determined in melt-spun Cu 70 Co 30 ribbon after annealing at 450 o C for 1 h. Two types of Co-rich precipitates were found in the as-spun ribbon, but neither of these appear to contribute to the observed GMR. On annealing, a very fine distribution of Co-rich precipitates forms at temperatures above 300...
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