Metastable solid solution alloy powders and bulk alloys in the cobalt͑Co͒-copper͑Cu͒ ͑10-90 mol % Co͒ system, which is an almost immiscible system at the ambient state, were prepared by mechanical alloying ͑MA͒ and shock compression. All MA-treated powders showed the x-ray diffraction patterns of a single phase of fcc structure. The lattice parameter increases with Cu concentration and is fundamentally on the line with Vegard's law. The magnetization curves of Co x Cu 100Ϫx (xϭ20-80) metastable bulk alloys at room temperature showed ferromagnetism, while the one of Co 10 Cu 90 system showed paramagnetism. The saturation magnetic moment (M s ) curve versus electron numbers per atom at 0 K was found to be similar to the Slater-Pauling curves of other transition-metal binary systems and decreased with increasing Cu concentration and approached zero at about 28.8 electrons per atom. The magnetoresistance ratio at room temperature increased with Cu content in the ferromagnetic region, while the one of the paramagnetic Co 10 Cu 90 alloy was negligibly small.
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