Magnetoresistance of (Fe, Co, Ni)-Cu Melt-Spun Ribbons

Abstract

Compositional dependence of magnetoresistance were investigated for (Fe, Co, Ni)-Cu melt-spun granular ribbons. It was found that the (Co75Ni25) 20 Cu 80 and (Fe22.35Ni77.65) 30Cu 70 ribbons annealed at 500°C for 30min. exhibits giant magnetoresistance (GMR) ratio of about 18 and 16%, respectively. For the Fe-Ni-Cu ribbons exhibiting large GMR, the magnetic particles were taken out of Cu matrix by chemical etching and change of magnetic property was studied. It was found that there is anti-ferromagnetic coupling between the magnetic particle in the Cu matrix as in multi-layered films.