GIANT MAGNETORESISTANCE AND MICROSTRUCTURE OF MELT-SPUN CU70CO30 RIBBONS

This paper reports an investigation on the giant magnetoresistance and microstructure evolution in melt-spun Cu70Co30 alloy. The results sho w that the phase separation is inevitable in the course of quenching, leading to the formation of two types of fcc magnetic Go-rich particle s but these do not appear to contribute to the magnetoresistance (MR). On annealing, a very fine distribution of Co-rich precipitates forms at temperatures above 573 K which are responsible fdr the high MR deve loped in this material.