Relevant GMR in As-Deposited Co−Ag Electrodeposits: Pulse Plating Deposition

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Abstract

Electrodeposited cobalt−silver heterogeneous films with giant magnetoresistance prepared by means of pulse technique have been investigated. The size distribution indicates that films are composed of superparamagnetic particles; however, ferromagnetic cobalt granules are also present. Magnetic and magnetotransport measurements support the presence of both kinds of particles. Structural analysis of the Co−Ag granular films revealed the presence of fcc-Ag and a mixture of hcp-Co and fcc-Co. No signs of solid solution were detected. GMR values up to 7% were measured at room temperature for the as-deposited films. High superparamagnetic contribution was observed in all conditions analyzed after the decomposition of the total magnetoresistance into its superparamagnetic and ferromagnetic contribution.

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