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Vol.37, No.6, 729 ~ 735, 1999

Title

Research Paper / Electronic , Magnetic & Optical Materials : Microstructure and Giant Magnetoresistance of Co15NixCu85-x Ribbons in the Process of Phase Decomposition

김익준Ick Jun Kim, 배차헌Cha Hurn Bae

Abstract

Giant magnetoresistance(GMR) of Co_(15)Ni_xCu_(85-x) Melt-spun ribbons is closely correlated with the microstructures produced by the spinodal decompodition. The solid solution range is extended by the replacement of the Cu by Ni in the as-quenched state. The compositional wavelengths obtained by the subsequent isothermal aging in Co-Ni-Cu are shorter than those in Co_(15)Cu_(85) binary ribbons, resulting in the increase of the surface-to-volume ratio. The largest MR ratio of 8.2% in high field has been achieved in the Co_(15)Ni_5Cu_(80) ribbon aged at 723 K for 4h. Further, the field dependence of MR ratio in low fields becomes larger with the Ni content and the largest mean MR ratio between 0 and 300 Oe, 2.6 %/ΔH, was obtained in Co_(15)Ni_(10)Cu_(75) ribbon. This behavior would be correlated with the shorter wavelength in the modulated microstructures.

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